A: Smith presents interesting evidence for those who believe that we should be trying to combat climate change now rather than later.
B: It is far too early to know whether Smith's predictions about climate change will be borne out.
C: When people complain about "suffering from global warming" on a hot summer day, Smith says, they have little idea what they are saying.
D: Perhaps another way to think about Smith's work is that it is a first glimpse into a field we are only recently beginning to understand.
