The Obama administration has enacted important reforms to prevent a Great Depression, reform health care, overhaul the financial system and education, and craft important breakthroughs with Iran and Cuba. But climate change occupies a category of its own. The damage from climate change is irreversible. Melted glaciers cannot be easily refrozen; extinct species cannot be reborn; flooded coastal cities are unlikely to be rebuilt. Action to mitigate climate change has an urgency nothing else can match.
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