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Houston’s polluted Superfund sites threaten to contaminate floodwaters.

Harris County has at least a dozen federal Superfund sites, more than any county in Texas. Up to 30 percent of the county is under water, spurring worries about toxics leaking.

As rain poured and floodwaters inched toward his house in south Houston, Wes Highfield set out on a risky mission in his Jeep Cherokee. He drove in several directions to reach a nearby creek to collect water samples, but each time he was turned back when water washed against his floorboard.

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How humans can avert mass extinctions of animals.

Unlike other creatures, humans can consciously shape the future for generations to come. We should use ingenuity for the benefit of the countless creatures with which we share the Earth. That would also be good for our species.

For millions of years, Australia had no human inhabitants. When people finally arrived there some 45,000 years ago, the continent had 24 different creatures weighing 100 pounds or more. Within a few millennia, 23 were wiped out.

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Here's how California could change its cap-and-trade program for climate change.

Here’s a look at how cap and trade works now and how it could work in the future.

California has some of the world’s most extensive policies for slashing greenhouse gas emissions, including regulations on vehicle tailpipes and requirements for renewable energy. But none of them has drawn as much attention as the cap-and-trade program, which requires companies to buy permits to release emissions into the atmosphere.

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Australian clean energy heading for 'valley of death.'

Australia's clean energy research efforts are heading for "the valley of death" if Parliament passes the Coalitions's omnibus package of cuts, according to leaders in the sector.

Australia's clean energy research efforts are heading for "the valley of death" if Parliament passes the Coalitions's omnibus package of cuts, according to leaders in the sector.

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