> But that still doesn't affect energy density. But it does? I think you're confusing energy density with power density. The former is an integral over time an

> But that still doesn't affect energy density. But it does? I think you're confusing energy density with power density. The former is an integral over time and would be monotically increasing with time since nuclear fusion would allow us to basically pull energy out of of thin (ok, maybe not so thin) air.