On the day we graduated Yale, the air we breathed had roughly 335 parts per million (ppm) of carbon dioxide (CO2) -- already a higher concentration than at any time in human history. Today, the air we breathe has roughly 420 ppm of CO2. The steady accumulation of heat-trapping gases such as CO2 in the atmosphere has contributed to devastating heat waves, wildfires, droughts and floods, with much more possible in the decades ahead. Yet at the same time, a clean energy revolution and growing public awareness offer hope for averting the worst threats from climate change.

Join classmates Sheldon Whitehouse (US Senator, Rhode Island and author, The Scheme), David Sandalow (author, Guide to Chinese Climate Policy and former senior official at the White House, State Department and US Department of Energy), Gail Kalison Reynolds (Yale FES in Terrestrial Ecology and land conservation expert), and James Stock (Vice Provost for Climate and Sustainability, Harvard University) along with Yale Trustee Fred Krupp (President, Environmental Defense Fund and Yale College Class of 1975) for a discussion of these issues.