"The leading cloud companies have a responsibility to address this energy usage"
Here's an idea : how about pushing molten salt reactors that use Thorium ?
That would be responsible in many ways, pushing the economy towards an energy technology that is plentiful and without any of the risks currently associated with nuclear tech.
Plus, given the amount of energy consumed by these data centers, they would be independent from the local grid and thus have a redundant energy source in said grid if anything went wrong.
This tech has been pushed aside from the cold war imperative of creating plutonium for nuclear bombs. We don't need plutonium any more, and nobody wants the hydrogen risks that pressure water reactors can create.
So think outside the box, people, and do something that is truly useful for Humanity and our future.