AlterNet: Three years ago, I became obsessed with global warming. Practically overnight, my worries about its potential effects outstripped my worries about so many other national and global issues, even personal ones. Indeed, as the mother of two young boys, I began to think it a bit crazy that I attended to every bump and scrape on my children’s little bodies and budding egos, but largely ignored the threat likely to put sizeable areas of the world, including parts of the coastal city where …