I'm not sure I follow. How is it gone? We have fusion (solar) and fission. And we may find out how to more directly harness energy as we progress. I think our access to energy is limited by our lack of knowledge.
I agree though, we should get out on some new space vessels soon to buy some insurance and project ourselves into the far future.
If we go extinct, the next intelligent species (if there is one) won’t have the easy reserves we used to get started. You can’t jump directly from fire to fusion.
I agree though, we should get out on some new space vessels soon to buy some insurance and project ourselves into the far future.