Writing on the Op-Ed page of today’s New York Times, Vaclav Havel — the playwright and former president of the Czech Republic — addresses humanity’s foot-dragging over global climate change, and the earth’s ultimate endurance. (Click here to read “Our Moral Footprint”.) “Maybe we should start considering our sojourn on earth as a loan,” Havel writes. “There can be no doubt that for the past hundred years at least, Europe and the United States have been running up a debt, and now other parts of the world are following their example. Nature is issuing warnings that we must not only stop the debt from growing but start to pay it back.” (For a Vaclav primer, click here.)