Protecting dozens of major coastal cities from future flooding will be challenging enough-rebuilding major coastal cities destroyed by super-hurricanes will be an almost impossible task.

Since 1955 the oceans have absorbed roughly twenty times more heat than the atmosphere.

Conservatives... are so opposed to government regulations that they are skeptical of anyone who identifies a problem that requires regulatory solutions - and they are inherently accepting of those who downplay such problems.

Time is short. We have at most a decade to sharply reverse course.

Would PBS go so far as to give air time to an even more extreme kind of disinformer, a Holocaust denier?

On moral grounds, I think that if you believe a certain outcome is a very possible outcome, you have an obligation to tell people that. With global warming, the probability of a bad outcome if we stay on our current emission trends is incredibly high. If you know a bad outcome is likely to happen, what right do you have not to communicate that? You go into a doctor's office, what are they going to do - not tell you the diagnosis?

Some 3 million years ago, when the earth was a little more than 3°C warmer than preindustrial levels (about 2.2°C warmer than today), Antarctica had far less ice and sea levels were a stunning 25 meters higher than today. If we stay on our current emissions path, the planet will almost certainly be that warm by the century's end.