Greenpeace is running the ad, above, all around Copenhagen, as the UN Climate Change Conference begins. The White House announced last week that President Obama will arrive at the Copenhagen summit for the final day, on Dec. 18, considered a crucial period when more international leaders will be in attendance, as opposed to his previously scheduled stop in Denmark this Wednesday on his way to receive the Nobel Peace Prize in Oslo. Climate protesters have been outside the White House for the last week, urging the President to take action.In DC, climate change and agriculture is a much-discussed topic, when health care reform isn't taking up all the air on The Hill. A good recap of the issues is here.