English to Chinese Bus/Financial Business/Commerce (general) commodity

And how large is this carbon market?
The European Union [carbon] market, which is mandatory [under caps set by the Kyoto protocol] is in its pilot stage. It covers about 40 percent of entities that emit greenhouse gases. Some industries are covered, but other sources, such as cars and aviation are not. Well, that market is now 2.2 billion tons of carbon dioxide. At full market, it would trade $60 [billion to] $80 billion annually at a low price of $15 a ton. [On May 16, the European market price (ECX) was just over $20 per ton.] At the high price, which used to be $35 a ton, that's $150 billion annually. Let's put that in perspective. The United States is the world's largest food grower. At the low end, that's twice the value of all food-commodity markets in the U.S. This promises to be the single largest commodity in the world. I would think that this market could be bigger than crude oil.