Socolow (prof at Princeton) published an article explaining the cost of inaction regarding global warming. Pacala (also prof at Princeton) and him wrote a paper in Science in 2004 proposing a way forward. Nothing was done, and seven years went by. The result: global warming mitigation will now be more difficult than seven years ago, and, even of stabilization within fifty years is achieved, there will be an additional 50 parts per million in equilibrium concentration of carbon dioxide.
The cost of inaction