Let's go with the good news first: Kerry is not our nation's chief science advisor:
Secretary of State John F. Kerry’s recent remarks on climate change at the Atlantic Council were so scientifically illiterate that I find it difficult to believe that he managed to barely get a D in geology at Yale University. As a US citizen and geoscientist, I feel it is my patriotic and professional duty to provide Secretary Kerry with a few complimentary science lessons.
The bad news is that he is our nation's chief diplomat.
But in Kerry's defense, making predictions about the future is hard whatever the field is.