What would change if energy could be created/destroyed?

What would change if energy could be created/destroyed?
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answer:The thing is, this old style of physical thinking is obsolete. We now know the universe would lose a very basic element of symmetry in order for mass-energy to not be conserved. From Wikipedia: “Noether’s (first) theorem states that any differentiable symmetry of the action of a physical system has a corresponding conservation law.” It’s hard to overstate the impact of Emmy Noether’s work on physics. Modern physicists find it difficult to revert back to the manner of thinking their predecessors used before symmetry and group theory became so fundamental.
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