CNN: Far-fetched fixes for climate change, from solar shields to air-scrubbing
"In the battle against climate change, efforts to reduce emissions of harmful gases like carbon dioxide have consumed most of the headlines. But many scientists say that simply minimizing man-made pollution is not enough to limit global warming to two degrees Celsius, as agreed in the 2015 Paris climate agreement -- humans must also devise other means to help cool the planet. There's no shortage of imaginative proposals to achieve this goal. Some involve sucking carbon dioxide out of the atmosphere; others, including a giant space-based solar shield, would reduce the amount of sunlight that reaches Earth."