Making an unprecedented call to action, the United Nations' climate panel said that to avoid catastrophe, all countries must change the way their people eat, commute, farm and build - and the changes must kick in right away.
The IPCC's report, released today (Monday, October 8), shows the impacts of even 1.5° of warming are far greater than previously expected, but also that it's definitely still feasible to hold warming to that level, according to scientific research organisation Climate Analytics.
Global temperatures have risen 1 degree Celsius above pre-industrial levels, researchers said, citing human activity and greenhouse gas emissions.
"Considering the urgency to rapidly decarbonise, the world needs a "Plan B", as the Plan A - the Paris Agreement - will push the world towards catastrophic warming".
"This is as you know the latest in a long line of reports dating back to the early 1990's from the IPCC and each time one comes out they do their best to ratchet up the alarm that the world's scientists have been giving us with so far precious little effect".
It was Trump's first reaction to the report, which says that the Earth surface has warmed one degree Celsius (1.8 degrees Fahrenheit) and is on track towards an unliveable 3 degrees Celsius or 4 degrees Celsius rise. Essential for pollinating crops, they will be more likely to lose half their habitat at two degrees than 1.5.
Bulgarian journalist Viktoria Marinova killed in Ruse
Mladen Marinov, Bulgaria's interior minister, described the murder as "exceptionally brutal", according to local news outlets. Sven Giegold, a German member of the Greens in the European Parliament, said all of Europe should worry about the killing.
Planned Kim summit narrowed down to 'three or four' locations
The 38 North project said last week that no dismantling activity had been spotted since August 3. Sceptics of Trump administration policy said it was hard to see what Pompeo had achieved.
Hurricane Michael takes aim at 300-mile Gulf Coast target
Hurricane Michael could produce three life-threatening hazards along portions of the northeastern Gulf Coast. Nathan Deal on Tuesday declared a state of emergency for 92 of his state's counties.
If the average global temperature temporarily exceeded 1.5C, additional carbon removal techniques would be required to return warming to below 1.5C by 2100.
"It's telling us we need to reverse emissions trends and turn the world economy on a dime", Myles Allen, an Oxford University climate scientist and an author of the report, told The New York Times.
If emissions can't be cut to a sufficient degree, researchers will need to devise effective methods of removing Carbon dioxide from the air, such as devoting land to growing trees and biofuel crops, Erik Solheim, executive director of the UN Environment Program, tells The Washington Post. Per the IPCC, humans need to slash carbon output to 45 percent below 2010 levels by 2030 and to straight-up zero by 2050.
Increased droughts and poverty brought on by the atmosphere's temperature climbing up to 1.5 degrees Celsius, if greenhouse gas emissions continue at the current rate.
But the data laid out by the Washington-based think tank in its study is misleading, economic and environmental experts have said.
The U.N. group, the Intergovernmental Panel on Climate Change, shared the Nobel peace prize with Al Gore in 2007 for its work to share information about climate change.
McKibben believes the odds of governments taking action in the wake of this report are slim.
This report shows the longer we leave it to act, the more hard, the more expensive and the more risky it will be.