Researchers from MIT want to deploy a raft of space bubbles to block sunlight and fight global warming. It probably won't work.

Politicians aren't in a hurry to lower emissions even as the world's temperature rises. Can we buy more time to fix the environment with a giant orbiting sunshade?

A new geoengineering experiment seeks to cool the Earth by safely emulating the aftermath of volcanic eruptions. But even if it's successful, all it can do is buy us time.

With no faith in politicians to help combat global warming, some scientists are turning to geo-engineering as a possible solution.