Given our government's stubborn, ignorant approach to global warming, it is difficult to explain why NASA keeps putting out such great material on the subject.
Their latest entry is this article, in which the scientists announce that "it's not too difficult to push the climate to a warm state" and predict that, should it occur, the mid-latitudes will probably be "a lot dryer." They emphasize that water's availability and distribution will be the challenges and hallmarks of global warming.
For an even less cheerful read, check out the highlighted article on boreal forests on the same page. It closes with the morbid observation that the "turning point" for those forests may be close at hand.