The European Union argues that one credit must equal one tonne of carbon dioxide for its Emissions Trading Scheme, the largest emissions market, to be effective.

欧盟严格遵循一个碳权只能用于抵消一吨碳排放，唯有如此，排放交易计划才能维持有效运作。

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First unveiled in 2005, EU-ETS requires aircraft operators flying within EU airspace to participate in a carbon credit trading program.

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In addition to increased yields of beef per acre, the Grasslands model also creates an opportunity to commoditize sequestered carbon for carbon credit trading.

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The European Union argues that one credit must equal one tonne of carbon dioxide for its Emissions Trading Scheme, the largest emissions market, to be effective.

ECONOMIST: Carbon markets