Some scientists view geoengineering, the concept of manipulating the Earth's climate, as our last line of defense against climate change. But geoengineering is controversial and it's unclear whether it could work.
Correspondent Josh Zepps explores the concept of geoengineering, from cool roofs to imitating volcanic eruptions and placing mirrors in the Earth's upper atmosphere.
Loading more stuff…
Hmm…it looks like things are taking a while to load. Try again?