Earth Day 50: Looking Forward A letter to all Earth Day 50 Challengers, past and future. Read More BlogErik WohlgemuthMay 31, 2016Erik, EarthX, Earth Day Texas, Earth Day 50, Earth Day, Summit, Future 500 Summit, Dallas, Texas, Trammell, collaboration, forests, ocean, Climate, corporate leaders, companies, NGOs, executives, activists, SRI, environment, sustainability, 2020, changemakers, investors, foundations