Commodity.com has a huge and useful page on how to get started trading in environmental commodities. Unfortunately it won’t let me paste it into here easily so below is a list of the subjects they cover. They are also very transparent about how they make their money (through links on their site), which I thought was honest of them. Anyway, enjoy!
What Are Environmental Commodities?
Types Of Environmental Commodities
History Of Environmental Commodities
What Drives Environmental Commodity Prices?
Environmental Commodity Exchanges
Environmental Commodity Brokers