A recent report on the faster than expected rises in the concentrations of carbon dioxide in the atmosphere should leave just about everyone worried. While, as with all individual pieces of evidence, it is hard to pin this to a cause, the continuing trend is not a hopeful one.

http://www.guardian.co.uk/climatechange/story/0,12374,1324379,00.html

or

http://news.independent.co.uk/world/environment/story.jsp?story=570734

It would be nice to see this be an issue in the US election, but so far no sign.