We live in a closed system with limited resources. More power means more quick resource consumption and faster pollution. In other words the quality of our environment will degrade faster. During the last few hundred years humanity has reaped the benefits of indiscriminate resource consumption giving little thought to the consequences, in practice borrowing QOL from future generations and from the environment. Imho it's not a long-term sustainable practice though.
More power means the ability to do things less efficiently - to pollute less. Steel, concrete, liquid fuels could all be carbon free, and what has been emitted sucked out of the atmosphere. Nearly every process that pollutes could be made to not - it 'just' takes energy.
As for everything else, we've barely even scratched the surface of this rock we're standing on - to say nothing of the rest of the dist system.
