I don't see why this needs to be politicized this heavily. The facts are essentially indisputably in the side of climate disaster as likely. This shouldn't be the cause of 'progressives' (although maybe it should be the cause of 'environmentalists' -- even though I'm not sure who the heck should be an 'anti-environmentalist' in right mind), this should be just something we have to do as a species living on the planet. If 'progressives' picked it up and (some) 'conservatives' did not, I think it's an unfortunate failure of conservatives (and science communicators, and society as a whole, etc.).

I support Nuclear Energy too, but I can see it has difficulty gaining traction for a huge list of reasons, and this is across the political, social and economic spectrum. But basically the need for Nuclear is largely obsolete -- it was the only attractive option when Solar (and Wind to an extent) wasn't so cheap. Solar costs about the same or less, is available more or less everywhere, and has no contamination issues.

Also of very worthy note IMO is that the (electrical) energy supply isn't the whole picture. A good chunk of emissions are from transportation sector and some from industrial processes. There is also advocacy in those sectors (which comes off as 'progressive') simply because of consistency and necessity to achieve a reasonable climate plan. Note that nuclear energy, or solar energy, can't solely avoid incoming disasters.