Whether it’s a deadly cold snap or a hole under an Antarctic glacier or a terrifying new report, there seem to be constant reminders now of the dangers that climate change poses to humanity.

Rep. Alexandria Ocasio-Cortez, D-N.Y., and Sen. Ed Markey, D-Mass., think they have a start to a solution. Thursday they are introducing a framework defining what they call a “Green New Deal” — what they foresee as a massive policy package that would remake the U.S. economy and, they hope, eliminate all U.S. carbon emissions.

That’s a really big — potentially impossibly big — undertaking.

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