Washington, DC, leading climate scientist Michael Mann of the University of Pennsylvania sat down with Climate Desk Live to talk about the significance of an planetary milestone—we’ve reached 400 parts per million of carbon dioxide in
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Chris Hayes from MSNBC talks to Michael E Mann about global warming deniers and the season we call “winter.” Release with full segment URL Chris Mooney in MotherJones: 1. Statements about climate trends must be ba...