Andrew Revkin of Columbia University gives the keynote speech for the Johns Hopkins Sustainability Leadership Council's Earth Day conference. Ben Zaitchik of the Johns Hopkins Morton K. Blaustein Department of Earth & Planetary Sciences moderates. The charge of the Johns Hopkins SLC is to provide advice and recommendations on policies, programs, and other initiatives that will build a greater role for Johns Hopkins in teaching, research, and leadership on environmental sustainability, both locally and globally. Visit https://sustainability.jhu.edu/about/sustainability-leadership-council/ to learn more.