El Salvador's president Nayib Bukele has said via a Twitter video that the country started its project to use geothermal energy—from volcanoes—to mine Bitcoin. It is ecology-friendly, and still Proof-of-Work.
https://decrypt.co/82201/el-salvador-volcano-bitcoin-mining-first-steps

Maybe he could consider mining Mooncoin one day?
There are not too many classic Proof of Work coins in the crypto world.
Mooncoin is one of them.
99 percent of coins are tokens and pos.