Futurist Stewart Brand, founder of The Long Now Foundation, has a new mission in life. He wants to bring extinct species back from the dead. Some ecologists thing that's an awful idea. Here are the arguments on both sides of the de-extincting debate.
Over at Environment 360, Brand debates this idea with Paul Ehrlich, a Stanford population biologist and co-author of The Population Bomb. The debate ranges from conservationism concerns, to ways we can make environmentalism into a cutting-edge science.