Tim Flannery believes no one can know the future with certainty, but the evidence is overwhelming that global warming will likely have devastating impacts. The time for debate and discussion has long since passed, he writes in his new book, “The Weather Makers: The History and Future Impact of Climate Change.” “If . . . we wait to see if an ailment is indeed fatal, we will do nothing until we are dead.” A noted zoologist and director of the South Australian Museum, Flannery says our fate is in our own hands – “for we are the weather makers, and...