New York Times: This diagnosis puts me in an interesting position. I've spent much of my professional life thinking about the science of climate change, which is best viewed through a multidecadal lens. At some level I was sure that, even at my present age of 60, I would live to see the most critical part of the problem, and its possible solutions, play out in my lifetime. Now that my personal horizon has been steeply foreshortened, I was forced to decide how to spend my remaining time. Was continuing to think about...