If this happens, history will remember Trump as the Neville Chamberlain of the climate catastrophe. He won't just be screwing America's plans, this is one of those areas where "leader of the free world" isnt hyperbole - America's decisions will have massive domino-effects on related economies.
Repealing Obamacare, dismantling the EPA and CFPB, appointing judges to the Federal and Supreme Courts who are friendly to rolling back gay and reproductive rights, privatizing Medicare -- these are all mainstream positions.
There is nothing preventing the Supreme Court from deciding to hear an appeal (eg, of a Clerk who doesn't want to issue marriage licenses) and then issuing an sweeping decision completely to the opposite of the new status quo.
That is the risk of relying on the Supreme Court to recognize unenumerated rights; the recognition will only last as long as the Court remains favorable to the right.
That isn't a negative personality trait either, we cannot as a people expect anyone to have empathy for a group they have no personal ties to, especially in contrast to real threats against themselves.
Both are problems, it is just those who are in danger of suffering from Trump's racism / xenophobia / sexism and their immediate peers see that as the more immediate threat, because he can undo decades of civil rights and equality in the first days of his presidency.
He can set in motion programs to destroy the climate more in the first days of his tenure, but it will take years to suffer the consequences of them, even if they are much more permanent than immediate regressions in liberty. For individuals, permanence does not matter - your time is limited, and everything Trump takes away represents days or years you will never get back of oppression.
I'm not sure this is true, but not because the sentiment is wrong: It implies that at some point, climate change will be as universally recognized for its negative effects as Hitler is, and that people will go back to examine how it happened. I don't have a lot of faith in the U.S. to get to either of those points; if I've learned anything from this election, it's that we have an astounding capacity to look at all the facts and just say, "ah, no thanks."
They'll look back on us and ask "what did they do when they had the best opportunity to stop this?"