Word: co2
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...higher levels of atmospheric CO2 that would likely be seen in a warmer future won't make much of a difference either - if the pine needles' pores are closed to prevent water loss, CO2 simply won't get in. Even more worrisome, the PNAS study doesn't take into account possible changes in precipitation patterns in a warmer future, which many climate models say could be drier, exacerbating the impacts of higher temperatures. "We can envision the landscape getting hammered over and over again," says Breshears...
...York's transit struggles are a reminder that even the biggest city in the U.S. can't fully control its environmental destiny. That's true for climate change too; even if New York meets its laudable CO2-reduction goals, that alone will do little to stop global warming. But the city is ensuring that it will be ready for a warmer world. The Bloomberg administration began by creating a homegrown version of the U.N. Intergovernmental Panel on Climate Change. Those scientists reported that by the end of the century, annual mean temperatures in New York City could increase 7.5ºF...
...Scientific staff in the George W. Bush-era EPA found that CO2 is a pollutant, but then administrator Stephen Johnson rejected the recommendation and delayed the process of regulating it, part of the Bush Administration's general obstructionism on climate change. When Lisa Jackson took over the EPA under the new President, however, she told Congress that one of her first acts would be to reevaluate her predecessor's decision, and she didn't drag her feet. "It's an exercise in leadership that takes the first step in regulating CO2 emissions from automobiles," says John Walke, the clean...
...concluding that greenhouse gases pose a threat to human welfare, the EPA's finding could lay the groundwork for nationwide regulation of CO2 emissions - just as the EPA is require to regulate pollutants like smog-causing sulfur dioxide. But regulating CO2 will be immensely more complicated - the U.S. emitted over 6 billion metric tons of CO2 in 2007 from countless sources - and business groups have raised the specter of a meddlesome EPA using greenhouse gases as an excuse to regulate projects large and small...
...While the EPA has so far been silent about how it might actually regulate CO2 - and the endangerment finding is only an early step in a process that could take a year or longer - environmentalists say it's difficult to imagine that the agency would attempt to control every possible source of greenhouse gas emissions. "People running the EPA have common sense," says Frank O'Donnell, head of the environmental group Clean Air Watch. "They're going to focus the efforts on the biggest sources" like the auto industry and the utility sector...