IMHO the question is who decides what to support. I think this could be done best and most transparent by local governments. The idea that lives in my mind is to split the payment 50/50 between UBI for people and "UBI for communities" (Amount of people define the payout amount). This way the acceptance of the currency can be maximized. We are competing with the USD directly, so we need all the support we can get.
@Bicknellski, there is a very easy way to reduce energy consumption for mining to a sustainable level: Reduce profitability by splitting mining reward like it was with Freidoin a