Economics isn’t all about money. It’s about human action, decisions and choices. In fact, economists and environmentalists could be natural allies in solving climate change. Unfortunately, a good number of environmentalists take a hardline stance on geoengineering, arguing that any further human manipulation of the environment is a bad idea. But with CO2 levels reaching more than 400 PPM, mitigation alone will not solve our problem. So how would an economist approach climate change?