While I can see that you might experience these as uncomfortable parallels, there is a big difference you could consider: That climate activism is based on scientific research.
Yes, but often “based on science” like biopics are “based on real events.” Activism presents no error margin whereas the actual science does, and very often activism extends into alarmism where it presents end of the world scenarios which the science doesn’t present. Activists too often present the future scenarios assuming no adaptation whatsoever, like a flooded Miami where no one has moved to higher regions. The science itself is increasingly skewed too, such as the recent forest fire study where larger drivers of forest fires like arson are ignored in order to make publication more likely.
This is like complaining that tidal models are useless because they ignore waves, which have a larger effect on water height than tides.
(The same analogy applies to claims of the form "how can we possibly predict the climate decades ahead of time when we can't predict the weather 2 weeks from now")
Communism is not based on scientific research.
Racism is real. And crt provides good insight with high degree of predictibility as to how our system of laws work to assist existing racial inequalities.
In any case, this feels like you're building a strawman.