Ordinary energy conservation laws are local: they do not just state that total energy is conserved, but that any change in energy in a finite region of any size is balanced by a flux of energy over the boundary of that region. I don't think any such laws exist in "multi-world-space", which even accepting MWI is basically a metaphor, not a precise concept.
So are there mysterious fluxes that move energy from one part of space to another?
This is a thread where people can ask questions that they would ordinarily feel embarrassed for not knowing the answer to. The previous thread is at close to 500 comments.