Research by Columbia geochemist Joerg Schaefer and his colleagues suggests Greenland’s massive ice sheet was largely absent in a warm period during the past million years when the global climate was much like today’s.

Park Williams, an assistant research professor at Lamont-Doherty Earth Observatory at Columbia University, said that there are three main factors that impact California’s fall fire season.

SwissRe, the world's biggest reinsurer, is confronting the financial impact of the climate crisis with help from a team of Columbia University scientists.

Adam Sobel, an atmospheric scientist and director of the Initiative on Extreme Weather and Climate at Columbia University, writes that both climate change and utilities contribute to California’s increasingly dire wildfire problem.

The strikingly volatile weather in many parts of the country does tell us something about the future — but probably not what kind of winter we are in for, explains Adam Sobel, an atmospheric scientist at Columbia's Lamont-Doherty Earth Observatory.

“I always feel like I’m the doctor who’s giving bad news to a patient,” said Marco Tedesco, a climate scientist at Columbia University’s Lamont-Doherty Earth Observatory.

Peatlands play an outsize role in the hazes because dry underground peat deposits provide “an inexhaustible supply of fuel,” says Robert Field, an atmospheric scientist at Columbia University who studies Southeast Asia’s haze.