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‘We are in a climate meltdown’: U.N. Secretary General calls for global action on climate

04:43

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Record number of fires rage across South America

03:20

Why are killer whale attacks on the rise? Scientists set sail to find out

03:31

Florida wildlife authorities hold annual python challenge

03:47

How researchers in Puerto Rico are working to save coral reefs

03:52

4.7-magnitude earthquake felt in Malibu and along the Southern California coast

00:42

New fire in Southern California threatens homes and sends residents fleeing

00:43

California wildfires threaten tens of thousands of homes

02:02

California adds coast guard plane to wildfire fleet

01:56

New effort to protect workers who struggle in stifling heat

02:15

New poll shows climate change as a top issue for young voters

02:34

Researchers investigate dozens of sick sea lions along California coast

01:49

‘Megaquake’ explained: Japan issues warning after 7.1-magnitude earthquake

01:33

Debby causes flooding and leaves trail of destruction in Georgia and South Carolina

04:44

Forest Service, environmentalists fight over how to save sequoias from wildfire

04:26

How climate change is speeding up the great Arctic melt

05:06

Northern California wildfire forces hundreds to evacuate

02:00

Veteran anti-whaling campaigner Paul Watson arrested in Greenland

00:56

Flower power: why it’s a banner year for hydrangeas

01:29

Young conservatives push Republicans to take action on climate change

02:53