• GAO says EPA overstates its enforcement record.

• Climate change linked to tiger attacks and increases in waterborne diseases.

• Landfills making cash off carbon credits through what they were already doing.

• Panel recommends canal to divert water around Sacramento-San Joaquin Delta.

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• Oregon Cascades hold a lotta water.

• Escaped lionfish devastating native species in Florida.

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• French-speaking nations pledge to halve CO2 emissions by 2050.

• Appeal could hold up Exxon Valdez payments.