• 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.

• Oregon Cascades hold a lotta water.

Escaped lionfish devastating native species in Florida.

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

• Appeal could hold up Exxon Valdez payments.