Emissions per head: 4t of CO2 equivalent.

人均排放量：人均4吨二氧化碳当量。

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Emissions per head: 25t of CO2 equivalent.

人均排放量：人均25吨二氧化碳当量。

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Emissions per head: 30th in the world (6t of CO2 equivalent).

人均排放量：世界第30位(合6吨二氧化碳当量)。

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Atmospheric concentrations of CO2 equivalent (carbon dioxide and other greenhouse gases) reached 430 parts per million last year, compared with 280ppm before the industrial revolution.

ECONOMIST: Getting warmer

The idea was that countries whose emissions fall under the emissions cap -- the permitted level of CO2 equivalent emissions per year -- could then sell those carbon credits to countries who are not able to meet their own caps.

CNN: All About: Forests and carbon trading

Each allowance represents the right to emit one ton of CO2 or CO2-equivalent GHG.

FORBES: The Climate Change Trap