Ice cover disappeared at an average rate of 29,000 miles a day.
"You're fired!" says the ocean.
The loss of Arctic sea ice cover has spurred a sharp rise in shipping traffic -- as well as coast guard rescue missions.
The U.S. and Canada committed to a range of climate actions, such as cutting emissions and protecting indigenous communities.
White House officials helped craft a deal Republicans wouldn't be able to stop -- and the effort required major political capital.
John Kerry promised $861 million in aid to countries on the frontlines of climate change.
One of the world’s largest oil producers is getting in the way of a deal, delegates and campaigners say.
Sanders' plan proposes a carbon tax, deeper emissions cuts, and investment in clean energy.
The president said that countries should be held accountable to periodic reviews of emissions targets.