Past Thinking about Earth-Like Planets and Life [pdf], presenting a brief history of thought on finding extraterrestrial life-like phenomena, is the first chapter of James Kasting's new book, How to Find a Habitable Planet. He participated in a discussion on BBC's The Forum.
Enjoy life while you can. Because we're doomed. Global warming has passed the tipping point, and catastrophe is unstoppable. James Lovelock is still at it. (Previously.)
James Lovelock, the creator of the Gaia theory, says that only a massive expansion of nuclear power as the world's main energy source can alleviate the effects of global warming. [Via WorldChanging.]