If this happens, temperatures across Europe and the Northern Hemisphere generally could drop.
"The climate is changing..." said Xavier Fettweis, a climatologist at the University of Liège in Belgium.
Synevyr National Nature Park in southwest Ukraine have said bears in their care are struggling to hibernate during an abnormally warm December.
"The precious Amazon is teetering on the edge of functional destruction and, with it, so are we," the editors of a leading scientific journal wrote.
Presidential candidate Bernie Sanders called for the prosecution of fossil fuel executives after claims in an article that ExxonMobil projected no reduction in carbon emissions by 2040.
The leak emitted more of the gas in 20 days than the oil and gas industries of some European nations do in a year.
Wetlands are the biggest natural source of methane in the world.
Climate scientists found that 14 of 17 climate models produced between 1970 and 2007 were broadly correct in their predictions, when differences in emissions were accounted for.
A draws on the expertise of 15 researchers from different disciplines to predict what a warming world will mean for the Earth's polar regions.
An expert told Newsweek: "This year's growth was slower than last year's. That's a glimmer of good news, but we need emissions to drop, not rise."
A fracture allowed the surface water to be transported to the land beneath the Arctic ice.
Floating ice shelves that encircle mainland Antarctica have been thinning in recent years, but the effect this has had on ice loss from the continent's interior has remained unclear.
Discussing their organization World War Zero, Arnold Schwarzenegger and former Senator John Kerry expressed the importance of showing that environmental policy is a bipartisan issue.
Protesters took to the streets to oppose the consumerism of Black Friday and to encourage politicians to pay more mind to climate change.
"It is worth recalling that the last time the Earth experienced a comparable concentration of CO2 was 3-5 million years ago," WMO Secretary-General Petteri Taalas said.
Scientists carried out a "very hands-on" study in Canada to arrive at their conclusion.
The final decades of the Assyrian Empire (912-609 BCE) were marked by political instability and conflict, but new research suggests droughts and bad harvests played a part in the empire's decline.
The city's mayor Luigi Brugnaro has blamed recent severe flooding in the historic city on climate change.
The study is the latest to find that climate change is bad news for penguins.
"The evidence is piling up that just as big tobacco misled the public and policymakers about the danger of smoking, big oil waged a decades-long deception campaign and covered up the origins of today's climate crisis."
Researchers say their findings represent some of the first evidence that evolutionary changes are affecting the time of year that wild animals give birth.
One of the article's signatories, Thomas Newsome at the University of Sydney, described a "moral obligation" for scientists to warn the public of any major threats to humanity.
Irish Prime Minister Leo Varadkar has prompted responses of outrage after stating in a speech that the "pluses and minuses" of climate change will result in some "benefits" for Ireland.
The Kincade Fire in Sonoma County has now burned an area of more than 60,000 acres.
"The result is the United States gets dirtier air and we get to pay more money for the dirty energy being provided," Robert Ukeiley of the Center for Biological Diversity told Newsweek.
While the federal government appears to be heading in the opposite direction, the experts we spoke to remain cautiously optimistic that the country can change things around.
"Given their power to shape public policy, businesses have a vital role to play in moving smart and effective climate policies forward," the letter said.
Although poor reproduction rates have been known to affect individual species in the past, this is the first time such low reproductive rates have been seen at every stage of the ecosystem.
"The world is waking up and we are the change. And change is coming whether you like it or not," Thunberg said at a rally in Denver.
"The climate crisis is feeding monster hurricanes that bring suffering and death to some of our nation's most vulnerable wildlife," the author of a new report said.