For a long time, geoengineering sounded like a bad Hollywood action movie plot. In a rush to save the planet from global warming destruction, our sweaty-browed heroes take drastic measures. They launch giant mirrors into space! They create fake volcanoes! They build massive carbon-eating machines! Such plans used to be easy to ignore, and it didn’t help that many started to emerge in the late 1970s. In 2006, however, geoengineering began to shed its freak show reputation. Nobel Prize-winning chemist and ozone layer protector Paul Crutzen published a scientific editorial on the subject in the journal Climatic Change.