This is not the biggest problem in the world. The biggest problem in the world is getting along with each other. But it's part of that because we're not going to get along with each other if we're not getting along with the planet.
"Richard Blane Alley" (born 1957) is an United States/American geologist and Evan Pugh Professor of Geosciences at Pennsylvania State University. He has authored more than 170 refereed scientific publications about the relationships between Earth's cryosphere and global climate change, and is recognized by the Institute for Scientific Information as a "highly cited researcher."More Richard Alley on Wikipedia.
Humans are moving the world out of its natural variability. I don't think there are any serious questions of the scientific credibility that big temperature variations move together with greenhouse gases.
The models we had were not terribly alarming about Greenland. This paper is a real wake-up call.
One person's trend is another person's fluctuation.
It's the ultimate all or nothing.
Some people have said that maybe global warming is good because it's heading off the next Ice Age. This points out that the next Ice Age is not imminent.
Greenland presently makes the largest contribution to sea level rise.
If we burn all the fossil fuels there are, the Greenland ice sheet will melt, raising sea levels 23 feet or so around the world.