Civilization's last chance The planet is nearing a tipping point on climate change, and it gets much worse, fast. By Bill McKibben May 11, 2008 Even for Americans -- who are constitutionally convinced that there will always be a second act, and a third, and a do-over after that, and, if necessary, a little public repentance and forgiveness and a Brand New Start -- even for us, the world looks a little terminal right now. It's not just the economy: We've gone through swoons before. It's that gas at $4 a gallon means we're running out, at least of the...