For years, the terms of the debate about climate change in the United States have been clear. One side — flush with fossil fuel cash — cast doubt on whether the problem existed at all, spreading disinformation and calling global warming an elaborate hoax to bring about socialism. For the most part, they were Republicans. On the other side were those who believed the science and usually rallied around some call for climate action, however vague. The conversation around the Green New Deal has brought those sides together, as politicians on both sides of the aisle scramble to cobble together a third way.

That Republicans being paid by the fossil fuel industry have come out against a plan for the United States to reach net-zero greenhouse gas emissions by 2030 is hardly surprising. That they’re being joined by prominent Democrats in casting doubt on the idea is a signal for how old tribalisms around climate change are starting to radically shift.