Dr. Philip Duffy is a physicist who has devoted nearly 30 years to using science to address the societal challenge of climate change. Dr. Duffy frequently engages domestic and international policy- and decision-makers, including delegates at the United Nations climate conferences, and the United States Congress. 

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Commentary

Francis gets the science and beauty of the Amazon but falls short on action to save it

Commentary: "To so clearly identify a threat to the stability of our climate, but to avoid calling for urgent and immediate action, is a missed opportunity and a half step."