Oil (fossil fuel) is going to fix itself, but not fast enough to keep climate change within reasonable bounds. But you can go a step further, the problem isn't

Oil (fossil fuel) is going to fix itself, but not fast enough to keep climate change within reasonable bounds. But you can go a step further, the problem isn't oil, but growth. Should we have an infinite supply of "clean" energy, we'd use it to destroy the environment faster (destroy forest, marine life, produce more plastic and so on...). These types of scenarii are well-explained in the "limits to growth" book.