climate change

2019 had three of the warmest months on record

No, it wasn't your imagination. 2019 was a historically warm year. During the summer, dozens of cities in the US sweltered under record-high temperatures and waited out historically long hot streaks.

COP25 ends quietly on watered-down deal

The message from climate activists was passionate, the warning from the scientific community and countries already experiencing the effects of climate change, urgent. The action from world powers has been excruciatingly slow and inadequate.

Trump mocks Greta Thunberg after her Time honor

President Donald Trump on Thursday again publicly mocked teen climate crisis activist Greta Thunberg, tweeting that the 16-year-old Swede who has inspired protesters worldwide has "anger management" issues.

India's tech cities are choking on their success

Like thousands of others, Megha Mathur moved to the Indian city of Gurgaon for a coveted job in tech. She soon realized she wouldn't be able to live there very long. The pollution was so bad she had to check an air quality app on her phone several times a day to see whether it was safe to go outside without a mask.

Massive waterfall formed on Greenland's ice sheet

What may have been the world's tallest waterfall briefly formed on Greenland's ice sheet last year, draining a meltwater lake of 5 million cubic meters of water -- equivalent to 2,000 Olympic-sized swimming pools -- in just five hours.