Best return on investment is most definitely finding new ways to produce energy and new ways to sequester greenhouse gases.

Anything else is a minor dampener to an exponential process.

Getting rid of Bitcoin is absolutely nothing compared to our exponentially increasing energy needs.

Lowering greenhouse emissions to 0 today would still result in dire consequences when the temperature increase comes, just from the massive n-th order effects.

I have no idea how the opinion of Bitcoin being so detrimental to climate came to fruition and how it's considered plausible at all.