From Environmentalleader.com: Japanese Prime Minister Taro Aso’s government recently approved a voluntary carbon-trading trial. Unlike the cap-and-trade system now used in Europe, where governments impose a mandatory ceiling and companies must buy carbon credits for additional emissions, Japan is allowing companies to set their own emission-reduction targets.

Participants in the trial can buy carbon credits from companies that emit less than their limit. They can also buy and sell U.N.-certified emission credits….. Full Article: Source