This is a really lazy response, but given the possibility that you genuinely don't understand the gp: Writing better software and reducing the (currently massive) waste of energy on enterprise bullshit and cryptomining would have a meaningful impact on international energy usage, and so help climate change.

It's marginal compared to the other power expenses to be sure, but computing is another rising power cost. Besides my AC, and cooking, I don't have any regular power expenditures other than digital devices, so it seems reasonable to me to want to optimize power expenditure there.

Regarding the distributed vs centralized, the reasoning is large data centers are inefficient and could be replaced mostly with local, low power systems which are barely on at all, versus constant-on, constant-ready server rack systems.