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By Kameryn Griesser, CNN (CNN) — Whether it’s answering work emails or drafting wedding vows, generative artificial intelligence tools have become a trusty copilot in many people’s lives. But a growing body of research shows that for every problem AI solves, hidden environmental costs are racking up. Each word in an AI prompt is broken

By Jackie Wattles, CNN (CNN) — Tens of thousands of years ago, our species — Homo sapiens — mingled and interbred with other prehistoric humans: our distant cousins, the Neanderthals and Denisovans. Hundreds of Neanderthal fossils give us a good idea of their appearance, lives and relationships, but so little is known about Denisovans that

By Ashley Strickland, CNN (CNN) — Scientists are trying to solve a decade-long mystery by determining the identity of anomalous signals detected from below ice in Antarctica. The strange radio waves emerged during a search for another unusual phenomenon: high-energy cosmic particles known as neutrinos. Arriving at Earth from the far reaches of the cosmos,

By Jacopo Prisco, CNN (CNN) — Each year, a tiny species in Australia makes a grueling 620-mile (1,000-kilometer) nighttime migration, and it’s pulling off the feat in a way only humans and migratory birds have been known to do, a new study has found. Bogong moths looking to escape the heat travel in the spring

By Ella Nilsen, Bill Weir, CNN Chief Climate Correspondent SOUTHERN MAINE (CNN) — Colin Goodson knows more about energy than most people. The tall, bearded Mainer is an engineer on an offshore oil drilling ship in the Gulf of Mexico. But when it came time for him to build a home in Southern Maine, Goodson

By Katie Hunt, CNN (CNN) — An enigmatic skull recovered from the bottom of a well in northeastern China in 2018 sparked intrigue when it didn’t match any previously known species of prehistoric human. Now, scientists say they have found evidence of where the fossil fits, and it could be a key piece in another

By Laura Paddison, CNN (CNN) — Rising global temperatures are set to devastate food crops across the world, with particularly alarming impacts projected for the United States, where production of key crops could plummet 50% by the end of the century, according to a sweeping new analysis. Of the many impacts of the fossil fuel-driven

By Ashley Strickland, CNN (CNN) — Astronomers have used mysterious fast radio bursts, or millisecond-long bright flashes of radio waves from space, to help them track down some of the missing matter in the universe. Dark matter and dark energy make up most of the universe. Dark matter is an enigmatic substance that shapes the

By Andrew Freedman, CNN (CNN) — The human fingerprint on global warming was likely evident in Earth’s atmosphere far earlier than previously thought—even before the invention of modern cars, a new study says. Using a combination of scientific theory, modern observations and multiple, sophisticated computer models, researchers found a clear signal of human-caused climate change

By Mindy Weisberger, CNN (CNN) — The sun was setting on a busy London street on a May evening in 1337 when a group of men approached a priest named John Forde. They surrounded him in front of a church near Old St. Paul’s Cathedral, stabbed him in the neck and stomach, and then fled.