It's been a long slog to get to this election day. We all know the campaigns spent millions to get their messages across. But Bob Grant at The Scientist wondered about the environmental cost (log-in required)--specifically how much the campaigns of Sens. Barack Obama and John McCain contributed to global warming.

About once or twice a month I get an email from some global warming denier ...

GLOBAL WARMING IS a planet-sized problem, so policy solutions tend to aim for the grandest possible scale. The signatories of the Kyoto Protocol have pledged to cut their greenhouse gas emissions at a national level, while laws in various countries and states seek to reform entire industries.

Online auction giant bans sale of ivory. But that's just the beginning of the fight over the online black market for rare animals. Next up: macaws, tigers, polar bears, etc. One eBay seller noted that "it’s the last chance to have such a polar bear skin since the species is endangered due to the global warming."