RolfAndreassen comments on "Stupid" questions thread - Less Wrong
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Oh, okay. Personally I lean much more towards average utilitarianism as opposed to total, but I haven't really thought through the issue that much. I was unaware that total utilitarianism was popular enough that it alone was sufficient for so many people to endorse space colonization.
But, now that I think about it, even if you wanted to add as many happy people to the universe as possible, couldn't you do it more efficiently with ems?
Ems are still limited by the amount of available matter. They may enable you to colonise non-Earthlike planets, but you still need to colonise.
In fact, pretty much everything possible is limited by available energy and matter.