Nova: Can We Cool The Planet

As global temperatures continue to rise, scientists are wondering if we need solutions beyond reducing emissions. Enter geoengineering. From sucking carbon straight out of the air to physically blocking out sunlight, the options may seem far fetched. Can geoengineering really work? How much would it cost? And what are the risks of engineering Earth's climate? Producer: Laurie Cahalane, Melanie Wallace, Ben Kalina, Frau. Author: Ben Kalina, Jen Schneider. Narrator: Nicole Lewis.