Ahead of the U.N. climate change summit in Paris, France, more than 180 nations pledged to voluntarily reduce greenhouse gas emissions, but many climate justice groups say far more needs to be done to keep global warming in check. We speak with one of the world’s leading climate scientists who has come to the Paris talks with a shocking message: The climate crisis is more severe than even many scientists have acknowledged. Kevin Anderson is deputy director of the Tyndall Centre for Climate Change Research and professor of energy and climate change at the University of Manchester in Britain. He has said many scientists are self-censoring their work to downplay the severity of the climate crisis.

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