>>Your fuel is still limited

If by 'Your' you mean the US, you might not know that it's now a petroleum net exporter. I'd agree that petro, like all extractive natural resources, is finite, but there's at least enough for a few decades, which I would take to be long enough to make the switch to renewables without a resultant currency crash. There's so much natural gas here that it's being flared off as a waste product in the places where there aren't already pipelines. There's also plenty of coal which is being phased out.

The US is fortunate in that it's one of the places on the planet with decent locations for both solar and wind. It's a big place, so the issues are electrical grid interconnects, pipelines, and potentially additional CNG plants to facilitate export to Europe (which indeed has an energy shortage)

All that said, I'd agree that the global environmental problem has not gone away. Global warming is leading to less predictable and more violent weather.

Also: Kardashev money? As in crypto? If there are multiple people involved, and in large enough quantity to affect a national currency, I'd be surprised if it could be kept secret.