Right now in New York, the annual carbon trading summit is unfolding. Naturally, protests are in tow, and today, Reverend Billy, from the Church of Life After Shopping, will be bringing his megaphone to an event starting about an hour from now in downtown New York at the Irish Hunger Memorial.The argument against is fairly obvious: Turning carbon emissions into currency (in a sense) is a capitalistic band-aid for a serious problem that should be handled by government.All the big dogs are represented at the summit-JP Morgan, Goldman Sachs, Chase, et al-and these protesters are aiming to draw attention to the cap-and-trade issue more broadly.What do you think of carbon trading? Do you think it's a viable part of a multipronged approach to combating climate change, or is it just another way for companies to make money off our mistakes?