The Knowledge
2025 was hotter than it should have been – 5 influences and a dirty surprise offer clues to what’s ahead
The past three years recorded unprecedented global heat, with 2025 being particularly warm. Factors such as greenhouse gas emissions and a decline in solar activity influenced temperatures and extreme weather patterns.
Michael Wysession, Washington University in St. Louis
The past three years have been the world’s hottest on record by far, with 2025 almost tied with 2023 for second place. With that energy came extreme weather, from flash flooding to powerful hurricanes and severe droughts. Yet, by most indicators, the planet should have been cooler in 2025 than it was.
So, what happened, and what does that say about the year ahead?
As an earth and environmental scientist, I study influences that affect global temperatures year to year, such as El Niño, wildfires and solar cycles. Some make Earth hotter. Some make it cooler. And one particularly unhealthy influence has been quietly hiding a large amount of global warming – until now.
Factors that made 2025 cooler than 2024
The Earth’s climate is the result of many factors that change from year to year. Some that helped make 2025 cooler than 2024 include:
La Niña’s arrival: La Niña is part of the El Niño-Southern Oscillation, a natural climate pattern that fluctuates between warm El Niño conditions and cooler La Niña conditions. During El Niño, the Pacific Ocean heats up along the equator, influencing the atmosphere in ways that can cause intense storms, droughts and heat waves around the planet. La Niña does the opposite; it’s like putting an ice pack on the atmosphere.
Both 2023 and 2024 were El Niño years, but in 2025 conditions shifted to neutral and then to La Niña starting in September.
The solar cycle: The Sun reached its solar maximum near the end of 2024, the peak of its energy output in an approximately 11-year cycle, and began declining in 2025. So, while the sun’s output was still stronger than average in 2025, it was less than in 2024.
Fewer wildfires: Despite some destructive blazes, the world also saw fewer wildfires during 2025 than 2024, which put less carbon dioxide – a planet-warming greenhouse gas – into the atmosphere.
Despite those points, 2025 still ended up as the third-hottest year in over 175 years of record-keeping and likely one of the warmest in at least several thousand years. It was nearly as warm as 2023, at 2.6 degrees Fahrenheit (1.47 Celsius) above the 1850-1900 average, according to the European Union’s Copernicus Climate Change Service. It also had the second-highest average land temperature recorded, up 3.6 F (2 C) compared to preindustrial years, with more than 10% of the land experiencing record-high temperatures.
Factors that made 2025 warmer than expected
Several other factors made 2025 warmer than expected, and some are likely to continue to increase in 2026. They include:
Greenhouse gas emissions: The big driver of global warming is excess greenhouse gas emissions, largely from burning fossil fuels, and 2025 had plenty.
Greenhouse gases trap heat near Earth’s surface like a blanket, raising the temperature. They also linger in the atmosphere for years to centuries, meaning gases released today will continue to warm the planet well into the future. The levels of carbon dioxide, methane and nitrous oxide in the atmosphere all increased in 2025.
Rising energy demand drove an increase in fossil fuel use. About 80% of the increasing electric power demand came from emerging economies, largely for rising air conditioning demands as the world gets hotter. In the U.S., the rapid growth of data centers for AI and cryptocurrency mining helped boost U.S. carbon dioxide emissions by 2.4%.
Earth’s energy imbalance: Other sources can disrupt the natural balance between the amount of sunlight that reaches Earth and the lesser amount radiated back to space. A recent study found that Earth’s energy uptake surged and temperatures rose quickly when a rare three-year La Niña in 2020-2022 shifted to El Niño in 2023-2024.
Declining polar ice, which efficiently reflects sunlight back into space, also affects the energy balance. As sea ice declines, it leaves dark ocean water that absorbs most of the sunlight that reaches it. In a spiraling feedback, warmer water melts sea ice, allowing more sunlight into the ocean, warming it faster; 2025 had the lowest winter peak of Arctic sea ice on record and the third-lowest minimum extent of Antarctic ice.
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Air pollution: Sulfate aerosol pollution from coal combustion and burning heavy fuel oil in shipping has also been affecting Earth’s energy balance. It has been masking the full effects of human-caused greenhouse gases for years by reflecting sunlight back into space, creating a cooling effect. But sulfate aerosol pollution is also a serious health hazard, blamed for about 8 million human deaths per year from lung diseases.
Recent reductions in sulfate pollution – now 40% less than 20 years ago – have meant about a 0.2 F (0.13 C) increase in global temperatures. Much of the reduction was from China’s efforts to reduce its notoriously bad air pollution in recent years and international shipping rules in effect since 2020 that have reduced sulfur emissions from large ships by 85%.
Taking all factors together, humans are now warming the planet at a faster rate than at any point in human history: at about 0.5 F (0.27 C) per decade. That extra heat can fuel extreme weather, including flash floods, heat waves, extended droughts, wildfires and coastal flooding, affecting human lives and economies.
Predictions for 2026
Most climate models predict 2026 will be about as hot as 2025, depending on whether a Pacific El Niño develops, which forecasters give about a 60% chance of happening. The planet is already starting the year out warm, even if it doesn’t feel like that everywhere. While January was very cold in parts of the U.S., globally, Earth saw its fifth-warmest January on record, and much of the western U.S. saw one of its warmest winters on record.
Solar output will continue to decrease slowly in 2026. However, the International Monetary Fund projects strong global economic growth at about 3.3%, suggesting electricity demand will also continue to grow. The International Energy Agency expects global electricity demand to increase by 3.6% per year through at least 2030.
Even though global renewable energy use is growing quickly, it isn’t growing fast enough to meet rising demand, meaning more fossil fuel use in the coming years. More fossil fuels burned means more emissions and more warming, while the ability of the ocean and land to absorb carbon dioxide continues to decrease. As a result, the atmosphere and oceans heat up, increasing the risks of passing tipping points – glaciers disappear, Atlantic Ocean circulation shuts down, permafrost thaws, coral reefs die.
If greenhouse gas emissions continue at a high rate, humanity may look back at 2025 as one the coolest years globally in the rest of our lives.
Michael Wysession, Professor of Earth, Environmental, and Planetary Sciences, Washington University in St. Louis
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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Nature
What in the Heck Is a Sweat Bee? Turns Out, My Wife Wasn’t Making It Up
My wife Rebecca said she thought a sweat bee stung her. I thought she was making it up. Turns out, sweat bees are very real—and their strange name actually makes perfect sense.
It started with a conversation with my wife, Rebecca.
She mentioned that she thought she’d been stung by something called a “sweat bee.”
My immediate reaction was basically:
“What in the heck is a sweat bee?”
I’ll admit it. For a moment, I thought she was making the whole thing up. 😂
A sweat bee? Really?
It sounded like one of those names somebody invents when they don’t know what actually stung them.
“It wasn’t a regular bee. It was a… uh… sweat bee!”
So naturally, I asked ChatGPT the same question: What in the heck is a sweat bee?
Well, Rebecca gets this round.
Sweat bees are absolutely real.
And Yes, They’re Interested in Your Sweat
Sweat bees belong primarily to the Halictidae family, a large group of generally small bees found around the world.
Some are rather ordinary-looking little insects, while others are surprisingly flashy, sporting metallic shades of green, blue, bronze or gold.
But here’s where they earned that wonderfully unfortunate name.
Some sweat bees are attracted to human perspiration.
They’re not after you because they’re angry, and they’re certainly not tiny vampire bees. They’re interested in the salt and minerals in your sweat.
In other words, after you’ve been outside working, gardening, exercising or simply trying to survive a hot summer afternoon, a sweat bee may look at you and think:
“Hey! Free electrolytes!”
Wait…They Can Sting Too?
Unfortunately for Rebecca, there’s another part of her story that checks out.
Female sweat bees can sting.
They’re generally not aggressive and aren’t flying around looking for people to attack. But if one gets trapped against your skin, squeezed or swatted, it may defend itself.
Their sting is generally considered relatively mild compared with those of many other bees and wasps—but “relatively mild” probably isn’t much consolation when you’re the person who just got stung.
So, Rebecca, I officially withdraw my skepticism.
Mostly.
Don’t Declare War on Them
As annoying as having a tiny bee land on your sweaty arm might be, sweat bees are actually beneficial insects.
They’re important pollinators, visiting wildflowers, garden plants and agricultural crops and carrying pollen from flower to flower.
So if one lands on you, gently brushing or blowing it away is probably a better idea than swatting it against your skin.
And that’s today’s unexpected nature lesson.
Sweat bees are real.
They really are attracted to sweat.
The females really can sting.
And, perhaps most importantly…
My wife was right.
There. I said it.
I’m sure I’ll never hear the end of this one. 😂
Related Links
- University of Arizona Cooperative Extension — Arizona Bee Identification Guide — A useful Arizona-focused guide that includes sweat bees and explains their appearance, size, nesting behavior and attraction to salt in perspiration.
- USDA Natural Resources Conservation Service — Native Bees and Their Favorite Flowers — More information about native pollinators and the important role sweat bees play around wildflowers.
- USDA Forest Service — Bee Basics — A broader guide to North American bees, including the colorful metallic members of the sweat bee family.
- Smithsonian National Museum of Natural History — Sweat Bee — See an actual female sweat bee specimen (Augochlorella aurata) and its scientific classification.
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Forgotten Genius Fridays
Forgotten Genius Friday: Marian Croak — The Inventor Behind the Way We Communicate
Marian Croak helped pioneer the technology behind internet calling and text-to-donate fundraising. With more than 200 U.S. patents, her innovations have transformed how millions of people communicate, work, and give.
Last Updated on August 7, 2026 by Daily News Staff
Every day, billions of people make video calls, join virtual meetings, send text-message donations during disasters, and stay connected with loved ones over the internet.
Few realize that one of the pioneers behind these technologies is Marian Croak, an engineer, inventor, and technology leader whose work has fundamentally changed how the world communicates.
Despite holding more than 200 U.S. patents and helping shape modern internet communications, Croak remains largely unknown outside the technology community. That’s exactly why she deserves a place in our Forgotten Genius Fridayseries.
From Engineering to Innovation
Marian Rogers Croak earned a bachelor’s degree from Princeton University before completing a Ph.D. in Social Psychology and Quantitative Analysis at the University of Southern California.
Her unique combination of engineering expertise and an understanding of human behavior would become one of her greatest strengths. Rather than simply building technology, she focused on solving real-world communication problems.
She joined Bell Labs, later becoming part of AT&T, where she spent decades developing new telecommunications technologies.
Helping Create the Internet Calling Revolution
For much of the twentieth century, telephone calls relied on dedicated telephone lines.
Croak helped pioneer technologies that made Voice over Internet Protocol (VoIP) practical, allowing voice conversations to travel over internet networks instead.
Today, VoIP powers countless services, including:
- Zoom
- Microsoft Teams
- WhatsApp calling
- FaceTime
- Internet-based business phone systems
- Telemedicine appointments
Millions of remote workers, students, families, and businesses depend on technologies that evolved from these innovations.
A Better Way to Help During Disasters
One of Croak’s most visible inventions came from a simple but powerful idea.
What if people could donate to disaster relief simply by sending a text message?
She led the development of systems that made text-to-donate campaigns possible.
Following disasters such as Hurricane Katrina and the devastating 2010 Haiti earthquake, millions of people contributed to relief efforts simply by sending a short text message. The technology helped raise tens of millions of dollars quickly, demonstrating how communication technology could save lives beyond making phone calls.
More Than 200 Patents
Croak has been awarded more than 200 U.S. patents covering internet communications, networking, emergency response systems, and digital collaboration.
Her inventions have influenced everything from enterprise communications to cloud networking and mobile technologies.
Leading Responsible Artificial Intelligence
In 2014, Croak joined Google as a Vice President of Engineering.
Today, she helps lead initiatives focused on Responsible AI and Human-Centered Technology, working to ensure artificial intelligence benefits society while addressing issues of fairness, accessibility, and trust.
Her career reflects an important lesson: innovation is not just about building powerful technology—it is also about building technology responsibly.
Honors and Recognition
Although Marian Croak spent decades working behind the scenes, her achievements have earned growing recognition.
Among her honors are:
- National Inventors Hall of Fame inductee
- National Academy of Engineering member
- American Academy of Arts and Sciences fellow
- IEEE Founders Medal recipient
These awards recognize a lifetime devoted to improving how people connect with one another.
Why Marian Croak Matters
Many inventors create products.
Marian Croak created possibilities.
Every internet phone call between grandparents and grandchildren, every virtual doctor’s appointment, every online business meeting, and every text-message donation during a humanitarian crisis reflects technologies she helped make possible.
Her story reminds us that some of history’s greatest innovators work quietly behind the scenes, changing the world without becoming household names.
That’s exactly the kind of legacy Forgotten Genius Friday exists to celebrate.
Related Links
- National Inventors Hall of Fame – Marian Croak — An excellent overview of Croak’s career, her work advancing VoIP, text-to-donate technology, and her induction into the Hall of Fame.
Learn more about Marian Croak at the National Inventors Hall of Fame - National Inventors Hall of Fame – The Problem-Solving Engineer — A deeper profile examining Croak’s path from an inquisitive young student to a telecommunications pioneer.
Read Marian Croak: The Problem-Solving Engineer - Google – Marian Croak — Croak’s official Google author and leadership profile, including her work in Responsible AI and Human-Centered Technology.
Explore Marian Croak’s work at Google - Google – Marian Croak’s Vision for Responsible AI — An interview exploring how Croak brought her decades of technological experience into the development of responsible artificial intelligence.
Read about Marian Croak’s vision for Responsible AI - Princeton University – Marian Croak and Innovation — Princeton highlights Croak, a member of its Class of 1977, and her contributions to VoIP, innovation, mentorship, and women in STEM.
Read Princeton’s profile featuring Marian Croak
🧠 Discover the remarkable innovators, inventors, and trailblazers who helped shape our world but rarely receive the recognition they deserve. Share your thoughts in the comments and subscribe to the STM Daily News newsletter to catch every new Forgotten Genius Friday feature and more inspiring stories delivered to your inbox.
The Knowledge
Exploring the Best Neighborhoods in Downtown Los Angeles
From the Arts District and Little Tokyo to the Historic Core and Bunker Hill, discover the best neighborhoods in Downtown Los Angeles and what makes each one worth exploring.
Last Updated on August 5, 2026 by Daily News Staff
The Best Neighborhoods in Downtown Los Angeles
Downtown Los Angeles has undergone one of the most remarkable transformations of any urban center in the United States. Once known primarily as the city’s business district, DTLA has evolved into a vibrant collection of neighborhoods, each offering its own unique character, history, dining, entertainment, and cultural experiences.
Whether you’re a first-time visitor, a longtime Angeleno, or planning your next weekend adventure, these are some of Downtown LA’s must-visit neighborhoods.
Arts District: Where Creativity Comes to Life
The Arts District has become one of the city’s most exciting destinations. Former warehouses have been transformed into lofts, art galleries, coffee shops, breweries, and award-winning restaurants.
Visitors can spend hours exploring colorful murals, browsing independent boutiques, and discovering public art around nearly every corner. It’s a neighborhood that celebrates creativity while preserving its industrial roots.
Perfect for: Art lovers, photographers, foodies, and nightlife.
Historic Core: A Walk Through Old Los Angeles
The Historic Core showcases Downtown LA’s architectural heritage. Along Broadway and surrounding streets, beautifully restored theaters, historic hotels, and early 20th-century buildings tell the story of a booming city during Hollywood’s Golden Age.
Highlights include the iconic Bradbury Building, Grand Central Market, and numerous rooftop restaurants overlooking the skyline.
Perfect for: History buffs and architecture enthusiasts.
South Park: Entertainment Central
South Park is home to some of Los Angeles’ biggest attractions, including LA Live and Crypto.com Arena. The neighborhood has added thousands of apartments, new restaurants, hotels, and entertainment venues over the past two decades.
Whether you’re attending a Lakers game, a concert, or simply enjoying dinner before an event, South Park offers something for everyone.
Perfect for: Sports fans, concerts, and nightlife.
Little Tokyo: A Cultural Treasure
One of only a handful of historic Japantowns remaining in the United States, Little Tokyo offers authentic Japanese cuisine, specialty shops, cultural events, museums, and peaceful gardens.
From fresh sushi and ramen to Japanese bakeries and tea houses, visitors can experience generations of cultural heritage in just a few city blocks.
Perfect for: Families, food lovers, and cultural exploration.
Bunker Hill: Downtown’s Cultural Heart
Bunker Hill combines modern architecture with world-class arts and culture. Home to Walt Disney Concert Hall, The Broad, the Museum of Contemporary Art, and Grand Park, this neighborhood is ideal for visitors looking to experience Downtown’s artistic side.
Its dramatic skyline and public spaces also make it one of the most photographed areas in Los Angeles.
Perfect for: Museum lovers and architecture fans.
Financial District: The Skyline of Los Angeles
Glass skyscrapers, luxury hotels, and bustling sidewalks define the Financial District. While it remains the city’s business center during the workweek, the neighborhood also offers excellent dining, rooftop lounges, and convenient access to other parts of Downtown.
Chinatown: Tradition Meets Modern LA
Los Angeles’ Chinatown blends rich history with a growing collection of contemporary restaurants, galleries, and community events. Visitors can enjoy traditional cuisine alongside modern culinary experiences while exploring one of the city’s oldest cultural neighborhoods.
Fashion District: A Shopper’s Paradise
Covering more than 100 city blocks, the Fashion District is one of the largest garment centers in the country. Whether you’re searching for fabrics, clothing, accessories, or bargains at Santee Alley, this neighborhood attracts shoppers from across Southern California.
A Downtown That Continues to Evolve
Downtown Los Angeles isn’t just one destination—it’s a collection of neighborhoods that reflect the city’s diversity, creativity, and resilience. From historic landmarks and world-class museums to vibrant street art and internationally inspired cuisine, DTLA offers something new around nearly every corner.
Whether you’re planning a day trip or an extended visit, exploring these neighborhoods is one of the best ways to experience the energy and history of Los Angeles.
Related External Links
- Discover Los Angeles – Explore Downtown LA
- Grand Central Market
- The Broad Museum
- Walt Disney Concert Hall
- Japanese American National Museum (Little Tokyo)
- Arts District Los Angeles
- LA Live
- LA Metro – Getting Around Downtown Los Angeles
- Olvera Street and El Pueblo Historic Monument
- Visit California – Los Angeles Travel Guide
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