What is the purpose of life without joy?
If we pass a working planet onto future generations, then those of the future who want the thrill of a finely tuned ICE engine should have an opportunity to experience it. After all, we did.
The greatest tragedy of the environmental movement is it has allowed its well-funded adversaries to cast it as a a dour, sacrificial dogma. We can and should leave room for joy.
Because, in the broader calculus, occasional joy + usual responsibility >> no joy + all responsibility.