California's ocean is looking a little more tropical. But El Niño isn't the only reason these unusual visitors are showing up.
California's ocean is looking a little more tropical. But El Niño isn't the only reason these unusual visitors are showing up.
A bus rider in St. Lucie County, Florida, walked through waist-high floodwater after torrential rain on Monday.
Blood-red snow. No victim. No weapon. The prime suspect is millions of microscopic organisms thriving on glaciers.
Mayon volcano erupted Friday in the Philippines, spewing ash nearly 10,000 feet above its summit and prompting authorities to recommend evacuations.
Glacier ice worms look like monsters from a horror movie. But they could reveal clues to how life survives in extremes — if they survive human-made warming.
Two dazzling atmospheric phenomena coincide for a unique moment of zen as seen from a cave in São Paulo, Brazil.
An astronaut aboard SpaceX Dragon and a videographer beside a lake in Canada share two amazing views of auroras.
Aerial footage shows a humpback whale creating temporary rainbows while swimming near Rancho Palos Verdes, California.
Ticks cause emergency room visits to jump every October. CNN Medical Correspondent Meg Tirrell digs into a 35-year study in New York that reveals how climate — and a few nuts — can help predict an area’s risk for Lyme disease.
Satellite research uncovers the potential origins of the Darvaza gas crater, a fireball of methane that has been burning for decades in Turkmenistan.
France’s wine regulators have loosened rules around champagne after a series of heat waves struck this summer.
New data shows this year’s El Niño has strengthened enough to be called a super El Niño. Here's what that means.
Yellowstone asked visitors to leave no trace. Some of you misunderstood. Crews are finding thousands of discarded items in sensitive thermal areas, including a few that raise obvious questions.
Dramatic wave-like clouds over Santa Cruz looked like a rough ocean hanging overhead, drawing attention for their unusual appearance.
Humpback, fin and minke whales were once rare sights near Greenland’s Scoresby Sound. Climate change is propelling a northward migration.
CNN Senior Climate Reporter Andrew Freedman explains what scientists mean when they describe an El Niño as the "strongest on record."
A powerful tornado toppled power lines and trees around a driver in the Appleton, Wisconsin, area. The EF2 tornado caused widespread damage in parts of the town and neighboring Menasha and Neenah, including to homes.
A Seattle-based company developed a hydrophobic spray to stencil artwork that only appears on rainy days.
Nazaré, Portugal, is home to some of the world’s biggest waves. The reason lies beneath the surf, in the form of Europe’s largest underwater canyon.
Meteorologist Chris Warren explores the clouds that are the byproducts of transportation and human civilization.
This lake, located just outside of Osoyoos in British Columbia, has distinctive, colorful spots that are created by a combination of its chemistry, geology and climate.
