- CNN columnist John Sutter talks with EPA Administrator Gina McCarthy
- McCarthy: 'Climate change is the greatest threat of our time'
CNN columnist John D. Sutter is reporting on a tiny number -- 2 degrees -- that may have a huge effect on the future. He'd like your help. Subscribe to the "2 degrees" newsletter or follow him on Facebook, Twitter and Instagram. He's jdsutter on Snapchat. You can shape this coverage.
(CNN)Like Hawaii's coral reefs?