That’s because the so called “climate crisis” is an issue that government can keep going to justify expanding its power. There are no concrete signs that anything the government is doing that’s geared towards climate change is fixing the issue
If government fixes the sewage problem, then the problem is over and done and there’s no crisis anymore.
No matter what the government does with climate, and no matter the results, climate wise (just imagine how much worse it would have been if we hadn't left all those people to freeze to death in the winter!) the 'results' can be twisted to justify what was done.
If the sewage problem is fixed, the Thames won't stink of shit.
If the results of the 'fix' fall short of that mark, it is a 'failure'.
In politics, the image of failure is to be avoided at all costs, even to the point of ignoring the problem.