Well, ag could probably be converted to have 0 "emissions" in a decade by simply ceasing subsidies.
Ai data center emissions aren't bad, but the sound pollutioj seems rough
All transactions then create an externality of some amount of forever data storage.
What's the difference between a 4mb tx and a 100kb tx and why is one negative?
My node validates transactions just fine with much less than 128 gb of ram. It's just your opinion that raspberry pi should be able to run full nodes and it is a false dichotomy to say islts raspberry pis or data centers.