Solar geoengineering: the complicated science and ethics of modifying the skies

Lowering carbon emissions remains a key part of fighting climate change, but scientists are exploring other options. The United Nations Environment Program is calling for more research into solar geoengineering to reflect some of the sun's light away from the Earth. We talk to Daniel Schrag, director of the Harvard University Center for the Environment; Andrea Hinwood, an environmental scientist with the UN Environment Programme; and Tero Mustonen, an adjunct professor in the University of Eastern Finland’s department of geographical and historical studies.