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The Cosmic Dance: Understanding the Newly Discovered Asteroid 2024 YR4 and Its Risk to Earth

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Asteroid

Astronomy enthusiasts and casual stargazers alike are buzzing with excitement—and a hint of concern—over the recent discovery of a new asteroid, named 2024 YR4. This celestial wanderer has recently caught the attention of both the European Space Agency (ESA) and NASA, particularly due to its increasing risk assessment concerning a potential impact with Earth.

What’s the Buzz About 2024 YR4?

Discovered on December 27, 2024, by the Asteroid Terrestrial-impact Last Alert System (ATLAS) telescope in Chile, asteroid 2024 YR4 is now on the radar for its increased chance of impacting Earth. Initially assessed at a 1.2% risk, fresh observations have revised this figure to 2.2% for a possible encounter on December 22, 2032. While the mathematics behind such percentages can be daunting, they essentially mean that we have a somewhat higher—but still relatively unlikely—chance of an impact.

The Evolution of Risk Assessment

What’s fascinating about asteroids like 2024 YR4 is how their risk percentages can change significantly over time. According to ESA, as more observations and data are gathered, these numbers typically fluctuate. This rollercoaster of statistics can be observed in the case of the infamous asteroid Apophis, which went from a high-risk designation to much lower probabilities thanks to more refined measurements of its orbit.

Experts from the CNEOS (Center for Near Earth Object Studies) note that tracking 2024 YR4 for more data is crucial. The more astronomers can observe it and refine its trajectory, the better equipped they will be to predict its path and assess any potential risk.

What If It Hits?

While the current risk of impact is low, concerns remain about what could happen if an asteroid of this size were to strike. Measuring between 131 to 295 feet (40 to 90 meters) wide, 2024 YR4 is comparable to a large building. Dr. Paul Chodas from NASA highlights that, should it be on the larger end of its scale, the damage could be significant, potentially affecting an area up to 50 kilometers (31 miles) from the impact site. Comparatively, past asteroid impacts, such as the one in Tunguska in 1908, resulted in immense devastation over vast areas.

Asteroids of similar dimensions have been known to strike Earth every few millennia—bringing with them the potential for severe regional damage.

Keeping Our Eyes on the Sky

The ongoing monitoring of 2024 YR4 is a collective effort supported by international organizations, including the International Asteroid Warning Network (IAWN) and the Space Mission Planning Advisory Group (SMPAG). Together, these groups work to analyze the asteroid’s trajectory, assess potential threats, and formulate response plans if necessary. Already, discussions around mitigation strategies are underway. These could range from deflecting the asteroid through means like NASA’s Double Asteroid Redirection Test to even evacuating potentially impacted regions.

For now, astronomers are racing against time to observe 2024 YR4 as it travels farther away from Earth and becomes more challenging to track. Our best window to study it financially is until early April, after which it will disappear from our view—returning only in 2028.

The Bigger Picture

While asteroid 2024 YR4 is getting a lot of attention, it serves as a reminder of the cosmos we inhabit, full of wonders and occasional threats. The collaborative efforts of international space agencies demonstrate how seriously we take the potential risks associated with near-Earth objects.

As the astronomical community keeps watch over 2024 YR4, we are also reminded of the technological advances that allow us to detect and track these celestial bodies. Thanks to the incredible human ingenuity dedicated to space exploration, we can keep an eye on our cosmic neighbors and stay informed about any future surprises from the universe.

So, while the chance of disaster is currently low, one thing is clear: the dance of celestial bodies continues, and it’s an exhilarating spectacle to behold! Keep looking up; you never know what you might discover next. 🔭✨

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Check out the story on CNN: https://www.cnn.com/2025/02/07/science/asteroid-2024-yr4-earth-risk/index.html

The science section of our news blog STM Daily News provides readers with captivating and up-to-date information on the latest scientific discoveries, breakthroughs, and innovations across various fields. We offer engaging and accessible content, ensuring that readers with different levels of scientific knowledge can stay informed. Whether it’s exploring advancements in medicine, astronomy, technology, or environmental sciences, our science section strives to shed light on the intriguing world of scientific exploration and its profound impact on our daily lives. From thought-provoking articles to informative interviews with experts in the field, STM Daily News Science offers a harmonious blend of factual reporting, analysis, and exploration, making it a go-to source for science enthusiasts and curious minds alike. https://stmdailynews.com/category/science/

Consumer Corner

Deed fraud can cause vulnerable Detroiters to lose their homes – here’s why it’s hard to catch the thieves

Deed fraud is rising in Detroit, where forged deeds can strip vulnerable homeowners of their property. Here’s how title theft works, why it’s hard to catch, and what reforms could help.

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A Black woman with long dark curls sits on the steps in from of a yellow brick building. Deed Fraud.
Deed fraud victim Kim Page sits on her front steps in Detroit on June 12, 2026. Nic Antaya/The Conversation, CC BY-ND

Donovan McCarty, Michigan State University

Buying her first home on Detroit’s far east side in 2021 was the moment when a lifelong dream finally came within reach for Kim Page.

“I accomplished something that I always wanted to do,” said Page, who grew up in the city. “I always wanted to buy my own home since I was like 18. I never wanted to rent from anyone.”

Page said she had saved US$15,000 and used $3,800 in cash to buy the single-family brick house on Britain Street. The house, owned by a friend planning to move out of Detroit, was “damaged pretty bad,” Page recalls. But the house was hers to care for, and she was determined to fix what was broken.

For the next several years, Page poured her sweat and paychecks into the property. Working first as a welder at automotive supplier Fisher Dynamics, and later as a phlebotomist, she paid for a dumpster, windows, a door, ceiling repair and an awning above her front porch. Page invested $27,000 in needed repairs and, in 2022, happily moved in.

But in August 2023, a storm damaged her roof. By March 2024, mold had grown inside the property, which made Page struggle to breathe; she moved in with family. She returned to the home in April 2024 for an appointment with a representative from the Federal Emergency Management Agency. That’s when Page noticed the locks had been changed. Perplexed but undeterred, she broke down the back door to get inside and purchased new locks, which she installed.

Then on a hot, summer day in July 2024, Page came home to discover all her locks had been changed again.

Searching for answers, Page called the Wayne County Register of Deeds’ Mortgage and Deed Fraud Unit. The staff confirmed she was a victim of deed fraud – a crime where scammers forge signatures to record a phony transfer of property ownership. Once criminals hijack the title, they can sell the property, rent it out or drain its equity with mortgages, potentially leaving the rightful owner to face the legal and financial fallout.

“I just was in shock,” Page said. “I can’t believe somebody really did this to me.”

A nationwide problem that’s hard to nail down

A small yellow-brick Craftsman bungalow sits in a dense neighborhood.
Like many homes targeted by fraudsters, Kim Page’s was sold in a cash transaction. Nic Antaya/The Conversation, CC BY-ND

Page reached out to me for help in March 2025. I’m a housing attorney, assistant professor at Michigan State University College of Law and director of the Housing Justice Clinic. I have represented dozens of victims of deed fraud.

I have also studied how property recording systems respond – or, more accurately, fail to respond – to fraud. My work examines how procedural gaps in title systems disproportionately harm elderly, low-income and minority homeowners.

Nationwide, deed fraud – also called quit claim deed fraud or home title theft – is a growing problem, including in New York, Boston, Miami and Philadelphia.

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Exactly how big a problem it is, is hard to know. The FBI does not track deed fraud specifically, instead grouping it into a larger category of real estate crimes.

From 2019 through 2023, 58,141 victims in the U.S. reported $1.3 billion in losses relating to real estate crime, the FBI says. However, that number is likely undercounted because many people don’t know where to report it, are embarrassed they were victims or don’t know yet they have been targeted.

In Detroit, deed fraud may be particularly prevalent because so many housing deals are made in cash and many properties owe back taxes. The Wayne County Mortgage and Deed Fraud Unit has tracked more than 13,000 inquiries regarding deed fraud and has opened over 2,300 cases throughout Wayne County since 2005.

Without oversight, the crime often goes undetected

Committing deed fraud is remarkably simple.

A deed is the legal document that transfers ownership of a home or other real property from one person to another. When a home is bought or sold, a deed is legally drawn up to reflect the transfer of ownership. That deed is then recorded with a county register of deeds, providing public notice of who legally owns the property.

A fraudster can forge the signature of the real owner – sometimes someone who is deceased. They can file a deed that appears valid on its face but isn’t.

They then record that false deed with a county register of deeds, the local government office that keeps public land records and other documents showing ownership, claiming title to property they do not actually own.

Fraudsters often target vulnerable people and properties, including elderly owners, families dealing with inherited homes, and houses that appear vacant or neglected, such as those behind on property taxes.

The incentive is clear: Once a fraudster appears to hold title, they can try to sell the property to an investor or an unsuspecting buyer looking for stable housing. I have seen fraudsters secure as much as $50,000 from one deal when they obtained a mortgage based on a fraudulent deed. One notable case of fraud targeted Elvis Presley’s former estate, Graceland.

In Michigan and most other states, recording offices do not have authority to substantively review a deed to determine whether it is fraudulent. If the document complies with technical formatting requirements, such as margin and font size, it must be recorded. Once stamped and indexed, the deed appears legitimate and can easily trick desperate buyers, investors, financial institutions and even police officers, lawyers and judges.

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In other words, the recording process is largely administrative, not investigative. The government office accepts and files the document without first verifying that the person signing it actually had the legal right to transfer the property.

That means a fraudulent deed can enter the public record, look valid to the outside world and remain undiscovered for months or even years.

Detroit is vulnerable

The housing market helps explain why Detroiters are more vulnerable to deed fraud.

Homes in Black neighborhoods nationwide are systematically undervalued compared with similar homes in white neighborhoods. Black borrowers are also more likely to be denied conventional mortgage loans. Detroit is about 73% Black, with a median household income of roughly $39,000 and a poverty rate exceeding 30%.

Man holds sign
In 2011, residents flooded downtown Detroit, demanding an end to home foreclosures and evictions. Jim West/UCG/Universal Images Group via Getty Images

In a market where access to traditional financing is uneven and home prices are relatively low, cash sales accounted for 4 in 10 sales in February 2024.

Lenders, brokers and title companies act as informal gatekeepers when people purchase a home using a mortgage. In cash sales, those actors are absent, and there are fewer opportunities to detect irregularities in the documented history showing how title passed from one owner to the next over time.

Illegal tax practices led to thousands of foreclosed homes

Property tax distress attracts fraudsters. Fraudsters seem to rely on publicly available tax foreclosure lists to identify properties that appear abandoned. They then pay the past-due taxes to remove the property from foreclosure and attempt to sell or mortgage the property using their fraudulent deed.

The fraudsters may also assume that the owner lacks the resources to wage a prolonged legal fight to recover title if they do uncover their scheme. In many cases, that assumption proves correct.

Michigan’s Constitution caps assessments at 50% of market value, but researchers have found that from 2009 to 2015, a majority of Detroit homes were assessed above that limit. Once those inflated bills went unpaid, interest, penalties and fees accumulated, often ending in tax foreclosure.

More than 100,000 Detroit residents lost homes in that crisis, and homeowners were overtaxed by at least $600 million between 2010 and 2016.

In a city already destabilized by unlawful tax foreclosure, fraudsters found opportunity in homes burdened by vacancy and broken chains of ownership.

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The burdens that deed fraud victims face

My first encounter with deed fraud came in July 2023. I received a request for legal assistance from a man who said he had been evicted from a home he claimed to own. Honestly, I didn’t believe him.

But when I pulled the court records and deeds, I learned he was right.

A fraudulent deed had been filed on his property, stripping him of title. The fraudsters then filed an eviction case against him.

The owner had no phone and no internet access to attend the virtual hearings. The court entered a judgment to evict him. A bailiff came, broke down his door and threw his belongings into a dumpster.

It took six months and two separate court cases before he was finally able to return to his home. He never recovered his belongings – and we never found the fraudster.

There are many other hardships for a legitimate owner. A fraudulent deed can prevent homeowners from selling their property, refinancing or accessing financial assistance programs.

To clear title, owners must file a quiet title lawsuit – a court action used to resolve disputes over who legally owns a property.

But quiet title cases are complex legal proceedings.

They require multiple filings, hearings and strict compliance with procedural rules. Even when fraud is obvious – for example, when a deed was signed by someone who was already deceased – courts generally require formal litigation to remove the cloud from the title.

Likewise, the legal process of notifying the defendant can be especially burdensome. Fraudsters often use fictitious names and addresses, making them difficult or impossible to locate. Even uncontested cases typically take months. If a defendant appears and disputes ownership, litigation can stretch for years.

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Filing fees, service costs and other litigation expenses accumulate quickly. Hiring an attorney can cost several thousand dollars, and some victims have reported spending tens of thousands clearing title to their homes.

As for Kim Page, her case is still ongoing. After being locked out of her home, she had to move in with relatives for over a year, putting a strain on their relationship. She was eventually able to return to her home, but the legal dispute over ownership has not been resolved.

A collage of close-ups of repairs needed: in a basement, an unfinished plastic pipe, a ceiling fan with debris inside, a door is boarded up
Repairs that still need to be completed at Kim Page’s home in Detroit. Nic Antaya/The Conversation, CC BY-ND

On top of that, she is facing a counter-lawsuit from the company that filed the fraudulent deed, requesting $50,000 for repairs the company made to the home while Page was locked out, along with property taxes and utility bills that the company says it paid to the county and utility companies on her behalf. The county opened an investigation, but it remains unresolved. As a result, she still has no idea who orchestrated the scheme.

While there are free legal services organizations to help, they have limited capacity, and income thresholds exclude some homeowners who still cannot afford private counsel.

Legal reforms likely won’t resolve systemic issues

Across the country, state legislatures have begun responding. Twenty-one have enacted deed fraud legislation, and 15 more have proposed it.

Another common intervention is fraud alert systems, which notify owners when any documents that impact the title of their property are recorded.

Other reforms increase notarial requirements or enhance criminal penalties.

These measures may deter some misconduct, but they do little to reduce the burden on victims once a fraudulent deed has been recorded.

In my assessment, meaningful reforms focus on empowering registers of deeds to substantively review suspicious documents before recording them; simplifying and expediting quiet title proceedings; and expanding civil remedies so victims can recover the costs associated with clearing their title.

Some jurisdictions like Texas and Florida have adopted streamlined procedures that allow victims to initiate quiet title actions using standardized forms with reduced fees. Others permit recorders, prosecutors or judges to act when fraud has already been established.

In Michigan, I am working with lawmakers and stakeholders to develop comprehensive legislation addressing these issues. Bills are expected to be introduced later this year.

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At the same time, my clinic has begun exploring how technology can help identify fraudulent deeds already in the record. We are working with computer scientists to evaluate whether artificial intelligence tools could flag suspicious filings and potentially prevent fraudulent documents from being accepted in the future.

No property system can eliminate fraud entirely. Preventive and punitive measures may limit fraud, but they cannot eliminate the incentive to commit it. For fraudsters, the payoff can be substantial.

Conversations about the issue often begin and end with the mechanics of the crime or the procedural burdens victims face afterward. Far less attention is paid to the housing market conditions that make some communities especially vulnerable in the first place.

Page, now 42 and working as a transporter for Sinai-Grace Hospital, has been coping with the stress of legal proceedings for the past two years and living with a heart condition so serious that she got a defibrillator.

The longtime Detroiter is fed up – with the lack of police help to find the fraudster, as well as the court system. All she wants is to be the rightful owner of the home.

“Give me my house back,” Page said.

Detroit editor Eleanore Catolico contributed reporting.

Donovan McCarty, Director, Housing Justice Clinic at Michigan State University College of Law, Michigan State University

This article is republished from The Conversation under a Creative Commons license. Read the original article.

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Consumer Corner

What’s in the price of a gallon of gas?

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A person stands between a gas pump and a vehicle, with gas prices of $4.29 for a gallon of regular displayed in the background.
Gas prices were well over $4 a gallon on April 28, 2026, in Brooklyn, N.Y. Spencer Platt/Getty Images

Robert I. Harris, Georgia Institute of Technology

The U.S. Energy Information Administration expects nationwide retail gasoline prices to average near US$4.30 a gallon for April 2026 – the highest monthly average of the year. The political response has been familiar. Georgia has suspended its state gas tax, other states are weighing their own tax holidays, and the White House has issued a temporary waiver of a law known as the Jones Act in hopes of moving more domestic fuel to East Coast ports.

As an energy economist, I am often asked about what contributes to gas prices and what different policies can do to affect them.

The price of a retail gallon of gas is the sum of four things: the cost of crude oil, refining, distribution and marketing, and taxes.

In nationwide figures from January 2026, crude oil accounted for about 51% of the pump price, refining roughly 20%, distribution and marketing about 11% and taxes about 18%. That mix shifts with conditions: When crude oil prices spike, that can drive more than 60% of the price; when the price drops, taxes and logistics are larger shares of the cost.

Crude oil is the biggest ingredient

Because the price of crude oil is the largest element, most of the price at the pump is derived from the global oil market.

Usually, big swings in crude prices come mainly from shifts in global demand and expectations – not from supply disruptions, according to widely cited research in 2009 by the economist Lutz Kilian.

But what is happening in early 2026 with the war in Iran is one of the exceptions: a classic supply shock. Severe disruptions to shipping through the Strait of Hormuz and attacks on Middle East oil infrastructure have taken millions of barrels a day off the global market.

Most drivers generally can’t quickly reduce how much they drive or how much gas they use when prices rise, so gasoline demand doesn’t change much in the short run. That means a jump in crude costs tends to result in people paying more rather than driving less.

Refining, regulations and the California puzzle

Refining turns crude into gasoline at industrial scale. The U.S. doesn’t have a single gasoline market, though. Roughly a quarter of U.S. gasoline is a cleaner-burning blend of petroleum-derived chemicals called “reformulated gasoline,” which is required in urban areas across 17 states and the District of Columbia to reduce smog.

California uses an even stricter formulation that few out-of-state refineries make. California is also geographically isolated: No pipelines bring gasoline in from other U.S. refining regions.

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California’s gasoline prices have long run above the national average, explained in part by higher state taxes and stricter environmental rules. But since a refinery fire in Torrance, California, in 2015 reduced production capacity, the state’s prices have been about 20 to 30 cents a gallon higher than what those factors would indicate.

Energy economist and University of California, Berkeley, professor Severin Borenstein has called this the “mystery gasoline surcharge” and attributes it to the fact that there isn’t as much competition between refineries or gas stations in California as in other states. California’s own Division of Petroleum Market Oversight says the surcharge cost the state’s drivers about $59 billion from 2015 to 2024. It’s not exactly clear who is getting that money, but it could be gas stations themselves or refineries, through complex contracts with gas stations.

A person stands near a long metal truck in front of a gas station.
A tanker truck delivers fuel to a gas station. AP Photo/Erin Hooley

Getting the gas into your car

The distribution and marketing category covers the costs of everything involved in getting the gasoline from the refinery gate to your tank.

Gasoline moves by pipeline, ship, rail and truck to wholesale terminals, and then by local delivery truck to service stations.

At the retailer’s end, the key factors are station rent and labor, the cost to buy gasoline in bulk to be able to sell it, credit card fees of as much as 6 to 10 cents a gallon at current prices, and franchise fees paid to the national brand, such as Sunoco or ExxonMobil, for permission to put their branding on the gas station.

Most gas station operators net only a few cents per gallon on fuel itself – which is why many gas stations are really convenience stores with pumps out front. Borenstein and some of his collaborators have also documented that retail gas prices rise quickly when wholesale costs climb but fall slowly when wholesale costs drop.

The question of gas tax holidays

The federal government charges a tax on fuel, of 18.4 cents a gallon for gasoline and 24.3 cents a gallon for diesel. States charge their own taxes, ranging from 70.9 cents a gallon for gas in California to 8.95 cents in Alaska.

When gas prices rise, many politicians start talking about temporarily suspending their state’s gas tax. That does reduce prices, but not as much as politicians – or consumers – might hope. Research on past gas tax holidays has found that consumers get about 79% of the reduction in gas taxes. That means oil companies and fuel retailers keep about one-fifth of the tax cut for themselves rather than passing that savings to the public.

Gas tax holidays also reduce funding for what the taxes are designed to pay for, typically roads and bridges. That pushes road and bridge upkeep costs onto future drivers and general taxpayers.

There is an additional problem, too: Taxes on gasoline are supposed to charge drivers for some of the costs their driving imposes on everyone else – carbon emissions, local air pollution, congestion and crashes. But Borenstein has found that U.S. fuel tax levels are already far below the true cost to society. Removing the tax on drivers effectively raises the costs for everyone else.

A fisherman holds a pole in the foreground as an oil tanker sails by at sunset
Suspending the Jones Act allows foreign-based oil tankers to sail between U.S. ports. AP Photo/Eric Gay

The Jones Act: A small number that adds up

The 1920 Jones Act is a federal law that requires cargo moving between U.S. ports to travel on vessels built and registered in the U.S., owned by U.S. citizens, and crewed primarily by U.S. citizens and permanent residents. Of the world’s 7,500 oil tankers, only 54 meet this requirement. Only 43 of these can transport refined fuels such as gasoline.

So, despite significant refining capacity on the Gulf Coast, some U.S. gasoline is exported overseas even as the Northeast imports fuel, in part reflecting the relatively high cost of moving fuel between U.S. ports.

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Economists Ryan Kellogg and Rich Sweeney estimate that the law raises East Coast gasoline prices by about a penny and a half per gallon on average, costing drivers roughly $770 million a year. In light of the war’s effect on gas prices, the Trump administration has temporarily suspended the Jones Act requirements – an action more commonly taken when hurricanes knock out Gulf Coast refineries and pipeline networks.

What moves the number

The result of all these factors is that the price that drivers see at the pump mostly reflects the global price of crude, plus a stack of domestic costs, only some of which are inefficient.

Tax holidays give a partial, short-lived rebate. Jones Act waivers trim pennies, though permanent repeal may cause more fundamental changes, such as reduced rail and truck transport of all goods, which could lower costs, emissions and infrastructure damage associated with cargo transportation. Harmonizing fuel blends across states and seasons may lower prices somewhat, but likely at the expense of increased emissions.

Ultimately, the best protection against oil price shocks is a more efficient gas-burning vehicle, or one that doesn’t burn gasoline at all. In the meantime, the best I can offer as an economist is clarity about what that $4.30 actually buys.

Robert I. Harris, Assistant Professor of Economics, Georgia Institute of Technology

This article is republished from The Conversation under a Creative Commons license. Read the original article.

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When your local reflecting pool or pond turns green with algae, don’t reach for chemicals – nature has better solutions

When ponds and reflecting pools turn green with algae, chemical “quick fixes” often fail. Here’s how nature-based solutions like Daphnia and aquatic plants can restore water quality longer-term.

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A man using an underwater vacuum stands knee-deep in the Reflecting Pool with the Washington Monument in the background.
A National Park Service employee uses a vacuum to clean the Lincoln Memorial Reflecting Pool on June 20, 2026. AP Photo/Mark Schiefelbein

Eric Palkovacs, University of California, Santa Cruz

When the Lincoln Memorial Reflecting Pool turned green with algae just days after a US$15 million renovation, the U.S. government scrambled for chemicals and expensive technical solutions to fix the iconic landmark.

Trying to kill algae with chemicals is a common response when community ponds or other water features go green. But as a scientist who studies freshwater ecology, I can tell you there are better solutions that cost far less, last longer and carry less risk of harm to pets and wildlife.

Rather than battling against nature, these alternatives work with nature for long-term solutions. https://www.youtube.com/embed/nkqBQ1r0Kto?wmode=transparent&start=0 If you need to treat a slimy, green, algae-filled body of water, you shouldn’t drain and refill the water, which resets the entire ecosystem. Instead, one solution is quite simple and relies on nature, not chemicals.

What went wrong on the National Mall

The algal bloom that turned the Reflecting Pool a vibrant green shouldn’t have been a surprise.

The pool is big, more than a third of a mile long and around 165 feet wide. But it’s shallow, meaning it warms up quickly in the sun. When it was repainted “American flag blue” during the renovations in spring 2026, the new color darkened the pool, and darker colors absorb more heat.

On top of those conditions, the pool was refilled with water from the nutrient-rich tidal basin of the Potomac River. The combination of warm water and nutrients created prime conditions for algae to bloom, turning the water pea soup green.

A tube into the Reflecting Pool, with the Jefferson Memorial in the background, puts out white bubbles.
In addition to hydrogen peroxide and vacuums, the government ordered nanobubble ozone technology to break up the algae. The nanobubbler contract was for $1.7 million. AP Photo/Jacquelyn Martin

As the national conversation over the Reflecting Pool shifts to political finger-pointing, an important environmental question deserves careful scrutiny: What is the best approach to maintain water quality in a case like this, whether for a national monument or a community water feature or pond?

Trying to chemically or mechanically remove algae can damage the structure of a water feature and may harm species in the water that could actually help solve the problem.

Importantly, chemical and mechanical solutions are only temporary fixes. When the Reflecting Pool is drained and filled again, there’s a good chance that algae will bloom again.

Natural algae control

Limnologists – scientists like me who study inland water bodies – have spent many decades learning why lakes and ponds turn green and how to clear them up.

Often, nutrient-rich waters fueled by fertilizer runoff from farm fields or sewage from cities are the sources that stimulate algal growth.

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However, natural ponds also host grazing zooplankton, which eat algae. For example, a type of zooplankton called Daphnia, known as water fleas because of the way these tiny crustaceans swim, can control algae by consuming it before it becomes a pea soup nuisance. Thus, a thriving Daphnia population can help maintain good water quality in a lake, pond or community water feature, even when nutrient levels spike.

A close-up image of a see-through water creature with eggs inside.
Daphnia are a genus of hundreds of species of tiny, see-through crustaceans that happen to be voracious algae eaters. A female Daphnia magna’s eggs are visible in this magnified image. Hajime Watanabe, PLoS Genetics, March 2011, CC BY

In addition to being highly effective grazers, Daphnia have another superpower – they can evolve rapidly. Urban waterbodies are often harsh environments with a variety of challenges, including high temperatures, low levels of dissolved oxygen, and pollutants. Daphnia can adapt to tough conditions, making these creatures an ideal source of algae control in many urban ponds.

Rooted aquatic plants are also useful for algae control in ponds because they absorb nutrients. Thus, shallow ponds with thick beds of aquatic plants can often resist algal blooms when nutrient levels rise.

Why draining might not be the best solution

One downside to draining and refilling a pond or urban water feature to try to clean it is that doing so resets the aquatic ecosystem, erasing the signature of any past evolution that has taken place.

Imagine Daphnia in a shallow pond that experiences periodic heat waves throughout the summer. Through repeated exposure to high temperatures, natural selection favors heat-resistant genotypes that can thrive in an urban pond.

Daphnia and other grazing zooplankton can also evolve resistance to some types of cyanobacteria, also known as blue-green algae, which produce compounds that are toxic to people and pets. Daphnia that evolve resistance to those toxins can help control harmful cyanobacterial blooms.

If a Daphnia population that evolved to tolerate warm temperatures, low oxygen levels or cyanotoxins is removed, the new population likely won’t be ready to handle those local challenges. This evolutionarily naive population will perform poorly in its new environment, reducing its effectiveness at controlling algal blooms.

As a result, traditional mechanical and chemical approaches may actually work against the goal of minimizing algae in ponds and other water features.

Nature-based solutions

The use of Daphnia to control algal blooms is just one example of solving environmental challenges with nature-based solutions.

Growing urban forests to provide cooling and improve air quality to help reduce the need for more energy-intensive air conditioning is another example. Maintaining urban wetlands can help reduce flooding, protect property and recharge groundwater more effectively and for less money than building and maintaining levees. Coastal marshes similarly reduce erosion, buffer storm surges and support fisheries.

All these urban ecosystems protect biodiversity and support human health and well-being.

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From national landmarks to city parks and backyard ponds, projects of all sizes can take advantage of nature-based solutions. While each specific project is unique, some general principles apply.

Ecosystems are most resilient when they are diverse and connected. So, it is beneficial to use a variety of species and genotypes and provide corridors that support the movement of organisms and their beneficial genes.

Urban climates are changing rapidly, so it helps to use species and genotypes that will thrive under future conditions, including rising temperatures.

Not every solution has to be engineered

The hubbub over the Reflecting Pool holds a mirror up to assumptions about how to solve pressing environmental challenges. The idea of just engineering one’s way out of any environmental crisis has limits.

Understanding ecology and nature’s mechanisms of ecosystem resilience can achieve sustainable solutions that benefit both nature and people.

Eric Palkovacs, Professor of Ecology and Evolutionary Biology, University of California, Santa Cruz

This article is republished from The Conversation under a Creative Commons license. Read the original article.

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