As global temperatures rise, scientists are exploring solutions from planting trees to sucking carbon out of the air to geoengineering. But would they work? And what are the risks of engineering Earth’s climate?

CICOES’s Sarah Doherty is featured in this new episode of NOVA. She talks about her work with the Marine Cloud Brightening Project and how scientists could use clouds, and their ability to reflect heat, to reduce the global temperature. Sarah appears at minute 28.00.