Organizers say that the current U.N. climate talks will be the first to neutralize all the greenhouse gas pollution they generate, offset by host country Peru’s protection of forest at three different reserves. Now the bad news: The Lima conference is expected to have the biggest carbon footprint of any U.N. climate meeting measured to date. Jorge Alvarez, project coordinator for the U.N. Development Program, says that at more than 50,000 metric tons of carbon dioxide, the negotiations’ burden on global warming will be about 1 1/2 times the norm. Peru’s hydroelectric power could be in danger by mid-century, anyway. Much of that water comes from glaciers that are melting at an accelerated pace.