Doing nothing has a huge cost. And not centuries from now.
The insurance companies are certainly doing accounting for climate change:
* https://www.munichre.com/en/risks/climate-change.html
* https://www.insuranceinstitute.ca/en/resources/insights-rese...
* https://www.scientificamerican.com/article/climate-change-is...
* https://vancouver.citynews.ca/2023/08/09/climate-change-cana...
They regularly have to pay out for what happens, and they're not happy about the direction things are going and are passing the cost along. Just ask anyone living in Florida:
* https://www.newsweek.com/florida-insurance-crisis-explained-...
* https://www.pnj.com/story/money/2023/07/12/florida-insurance...
And it's probably a fairly safe assumption that it's only going to get more expensive.
The environment we live in, BTW.
The planet itself will be fine: it has been smacked more than once with asteroids and is still here.
What we're talking about is preserving the climatic conditions that human civilization can comfortably live in. "Saving the environment" is about saving ourselves.