What will it take to keep Earth habitable for humanity? Neil Tyson finds out from EPA Administrator Gina McCarthy. Also featuring environmental blogger Andrew Revkin, science historian Naomi Oreskes, co-host Maeve Higgins and Bill Nye the Science Guy.
Infectious disease expert Laurie Garrett is back with Neil deGrasse Tyson to answer your questions about deadly viruses and current epidemics like H7N9 influenza and MERS-CoV.
