We shouldn’t defederate. The environmental impact depends on the tech and how you produce power…
Also other than cash, bartering, monero is the only currency that respects privacy.
We need privacy and anonymity in a free society, even a solar punk one.
I think the key here is authoritarianism. Authoritarian leftism is not eco-friendly at all.
You have some more right wing ideologies that are eco-friendly like geolibertarianism.