Through some combination of government intervention and the development of carbon trading markets, it seems inevitable that a price will eventually be put on carbon around the world. Underscoring this, a carbon price has been proposed as part of several bills before Congress, but other mechanisms like a cap on emissions in a sector or geography would achieve the same effect. Economic models and the experience of the EU Emissions Trading System suggests that a price could likely be between $50 and $100 per ton of CO2 in the near term and rise from there. At $100 per ton that would represent five percent of the global economy. Five percent of the global economy is a huge number. But where does this liability sit? With the world’s corporations.