That's a good point. I think you are definitely correct. However, I think it's also true that some of the other solutions are likely to happen "on their own"

That's a good point. I think you are definitely correct. However, I think it's also true that some of the other solutions are likely to happen "on their own" eventually. E.g. technological advancements in alternative energy and electric cars are likely to eventually allow them to replace alternatives (if the environment survives long enough). A lot of the other parts of the solutions don't have good ways to accomplish them. For example, I don't see a good way to reduce travel or population growth.