Has big business finally seen the light? That a carbon-based economy is unsustainable? A quiet revolution within the US Chamber of Commerce suggests that a tiny insurrection may be happening. With 3 million members, the Chamber is one of the most powerful lobbies in Washington -- but this week, they lost a member. Energy company Exelon announced it's leaving. And they're the third energy company to do so. The companies say they?re at odds with the Chamber?s stance on global warming and particularly its call for a 21st Century ?Scopes monkey trial? about the science of climate change. They also argue that the Chamber?s opposition to carbon emission taxes is behind the times. It maybe an ah-ha moment. Or it may be simply smart business. Public utilities and energy companies know that image counts for something. Supporting climate change legislation is a good marketing strategy. It probably won't cost them that much either. If you think healthcare reform has been watered down, just wait til you see what happens to cap and trade. As it currently stands, the c and t proposals are market-based solutions that still permit polluters to pollute, as long as they buy so called pollution credits from someone greener. As environmental writer Gar Smith recently put it, as far as the planet's concerned cap and trade schemes just don't work. Instead of paying for solutions, purchasers are buying polluting time. A solution would require a much greater overhaul of the US economy, one that would severely impact ?some powerful vested interests,? says Nobel Prize winning economist Paul Krugman. Getting out of the Chamber of Commerce at this point is probably more about saving face than saving the planet. But prove me wrong, why don't you. I'd love it. Less