(Note: This interview originally aired back in October.) What's it like to live on one-tenth of the fossil-fuel consumption of the average American? Alarmed by the drastic changes now occurring in the Earth's climate systems, our guest on today's ST -- who is a climate scientist and father of two -- decided to find out. And he's very glad he did. Peter Kalmus is our guest; he is an atmospheric scientist at Caltech / Jet Propulsion Laboratory, and he has a book out. As he announces in this book,