One thing people don't get about headline figures for the cost of tackling climate change;
the money isn't pissed up the wall, it goes towards jobs, research, materials, and contributes to economic activity.
Example: A government grant funds the research into a new type of solar panel
A multitude of researchers are funded for a couple of years (jobs)
Local manufacturing firms receive orders for prototypes (jobs)
Materials are mined (jobs)
Patents then exploit the green technology
and all through that process is tax at every level. The government recoups the investment!