Chinese wind projects illustrate the way regulators within a country can game the carbon credit system, by lowering subsidies and tweaking power prices in order to qualify for carbon credit subsidies.

U.S. food aid programs spend more than 50 cents of each dollar on shipping, which is restricted to a small group of U.S. companies that lobby Congress.

The Europe-wide scam is one of the latest in a series of carbon credit scandals mounting worldwide as the industry booms.