I replied to Elon's tweet about Bitcoin using so much energy, asking if Tesla would be interested in becoming a witness in the Obyte network. Chances are near zero he even reads it, but still better then nothing.
Maybe the "green" aspect of Obyte coud get a little more emphasis in the marketing...
I did the same, the more people do it, the higher chance we have to get noticed, by anybody. But I think Elon FUDed Bitcoin for other reasons (maybe nobody bought any Tesla with it).
I don't think Bitcoin goal was to build a currency that would be energy efficient, I think any cryptocurrency will consume more electricity than traditional finance at same scale because the more full nodes there are keeping the copy of the ledger, the more resources are used. So, while PoW coins are clearly more wasteful because of miners, there is even more power consumption based on how distributed they are. And that's reasonable cost for decentralization.
Obyte has no PoW, not even the local one like Nano and IOTA have.
So, the least power consuming cryprocurrencies are in this order (without taking account how many full nodes they have):
1) (d)PoS, DAGs without local PoW and other non-PoW
2) feeless DAGs with local PoW
3) PoW with low hashrate
4) PoW with high hashrate