When giant icebergs fracture from their parent shelves, scientists get worried.
Coastal villages are washing into the Bering Sea, trees are sprouting in the tundra and shipping lanes are opening in an ocean that was once locked in ice.
Washington Governor Jay Inslee said that failing to recognize climate change was "one of the highest derelictions of duty that I've ever seen by a presidential administration: that we should just give up and suffer these losses. It's not very American."
The report comes two years after the Paris Agreement, where nations agreed to try to limit global warming to 1.5℃.
The frequency of more potent storms is growing, but the storms are also slowing down in speed, inundating the ground below.
From a monkey cradling a plastic bottle to a diver's effort to untangle a turtle from ocean trash, this is our selection of the most stunning photos from this year's competition.
"Our action now locks in how the ice will react for centuries and millennia to come," warned the study's author.
The new bill requires the state to use 50 percent of its energy from renewable sources by 2026.
"The sixth mass extinction is taking place at unprecedented speed. But it is not too late to avert the worst," 200 celebrities and scientists said in an open letter.
Biodiversity changes over the next 100 years could be as severe as when the planet emerged from the last ice age.
Patricia Espinosa said this year's extreme weather events "make the evidence clear that climate change is having an impact on the daily lives of people."
The summer of 2018 brought an epidemic of major wildfires in the Northern Hemisphere.
"We don't test the hull of a ship by ramming progressively larger icebergs until we find one that will break it."
As soon as 2031, five times as many people could die due to heat in the U.S. alone, researchers say.
More than 600 million people live in low-elevation coastal areas, less than 30 feet above sea level.