Wait, I don't even know you could profit out of carbon emissions
It profits from others' carbon emissions. The "green" companies receive certificates and they can sell them to those who pollute.
I've read somewhere not long ago that Tesla, for example, earns more from carbon certificates than from making and selling cars.
This market can be clearly be made efficient by the use o blockchain, yet not completely decentralised I recon. Certification, rights of emission, participants proof of identity and exchanges are all a default in the blockchain world. This could save millions?
I'm not sure if blockchain would be of any help, since we don't talk about something that is or can become decentralized.
Also afaik the companies make their own deals with the certificates, with special prices based on the amounts, the previous (similar or not) deals between those companies and so on.
You know, "I sell you certificates cheaper and you sell me this or that components cheaper"; I don't have a full overview on that market, but I have a feeling that's more complicated than Bitcoin markets.
And in the future I expect it to change, as a result of politics deciding to "punish" even more the polluting businesses, maybe not rewarding this good the clean ones.