An article by Cass R. Sunstein, Bloomberg

With respect to the science of climate change, many experts regard the Intergovernmental Panel on Climate Change as the world’s authoritative institution. A draft summary of its forthcoming report was leaked last week. It describes the panel’s growing confidence that climate change is real, that it is a result of human action, and that if the world continues on its current course, it will face exceedingly serious losses and threats (including a significant rise in sea levels by century’s end).

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