Carl Sagan on Climate as an Emerging Issue (1990)
Carl Sagan's keynote speech before the 5th Annual Emerging Issues Forum at NC State University
Climate change morphing into an existential problem (2017)
With unchecked emissions of climate pollutants
Trends and Challenges of Global Transition to Green Economy (2016)
Oxford Martin School, University of Oxford
James Lovelock speaks Planetary Stewardship 1991
James Lovelock visits the University of Kansas in 1991 to deliver a guest lecture on his still-controversial and provocative Gaia Hypothesis.