Researchers show that humans are reversing a long-term cooling trend tracing back at least 50 million years, and it's taken just two centuries.

Under future climate scenarios, changing winds may make it harder for North American birds to migrate south in the autumn but easier for them to come north in the spring.

Ozone layer depletion has increased snowfall over Antarctica in recent decades, partially mitigating the ongoing loss of the continent’s ice sheet mass, new University of Colorado Boulder research finds.

Look at a digital map of the world with pixels that are more than 50 miles on a side and you’ll see a hazy picture: whole cities swallowed up into a single dot; Vancouver Island and the Great Lakes just one pixel wide. 

The largest extinction in Earth’s history marked the end of the Permian period, some 252 million years ago.

The air in Beijing is often very bad. The city sinks under a brown cover made of exhaust gases from industry, cars and coal fires, which blow a lot of harmful particulate matter, soot, sulfur dioxide and nitrogen oxides into the air.

A destructive fire-generated vortex – a massive stream of rising, spinning, smoke, ash and fire – that topped out at 17,000 feet above the earth, accelerated the Carr Fire that killed eight people and devastated a widespread area in the Redding, California region in July 2018. 

Cacao farmers in Nicaragua lose their crop, the main ingredient for chocolate, to fungal blight and degrading soils. 

Once spring-run chinook salmon disappear, they are not likely to reemerge, indicates genetic analysis of the revered wild fish in a study led by the University of California, Davis. Prompt conservation action could preserve spring-run chinook, as well as their evolutionary potential.

Fires that contribute to deforestation spiked six-fold in Colombia in the year after an historic 2016 peace agreement ended decades of conflict between FARC guerrilla and government forces, according to a study in Nature Ecology & Evolution.