> even cow farts are much bigger than CO2 footprint of Bitcoin.

It sounds like you're trying to joke about "cow farts" but they're a well-known massive source of pollution, I don't think it's a flattering comparison

> but Internet uses more

So the most important innovation of this century, used by billions of people daily, uses more energy than a financial network doing only ~400,000 transactions per day?

If Bitcoin were to replace the entire financial sector, sure, it would be worth the energy expenditure. But as it is, there are solutions thousands of times more efficient for all of the problems Bitcoin tries to solve.