At the Poznan climate summit, Mexico's Environment Secretary Juan Rafael Elvira announced his administration's plan to cut 2002 greenhouse gas emission levels by 50% by 2050. The Mexican plan includes a carbon trading system that would set emissions limits on certain sectors, such as electricity and oil refining. Companies that reduce their emissions below those limits could sell their unused allowances on the international carbon market. Mexico is the world's 13th largest emitter og greenhouse gases, and the announcement was intended as a challenge to other developing nations. South Korea has said it would announce an emissions cap next year, and South Africa has a detailed plan to peak emissions in 2025. (AP, The Guardian, Dec. 11)

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