I've seen many projects about this but it seems most of them are lacking on something. Carbon credit market is a billion dollar industry and applying blockchain will be good for both industry.
The carbon credit market isn't helping for lowering carbon emissions.It should be banned.
We could create a new coin-CARBONCOIN and the mining of that coin should be reducing carbon emissions by using green technologies,such as solar panel and wind turbines.
That's just an idea...