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Despite the cascade of other crises this year, climate change has emerged as a key election issue. The two major-party presidential candidates' positions on it could not be more different.
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U.S. production of heat-trapping greenhouse gases fell 2.7 percent last year. But larger cuts will be needed to address climate change.
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California is leading a lawsuit challenging the Trump administration's plan to weaken car emissions standards. EPA chief Scott Pruitt says the rules, designed to fight climate change, are too strict.
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Mayors from across the country also agreed to meet goals similar to those in the Paris climate accord, which President Trump announced earlier this year the U.S. would withdraw from.
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Scientists concede that oil and gas production is only partly to blame for the 3 percent surge in the greenhouse gas in the last decade. Obama tightened rules on the industry. Will Trump repeal them?
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It has been a common belief that low-emissions vehicles, like hybrids and electric cars, are more expensive than other choices. But researchers at MIT have found otherwise.
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Many farmers who grow corn and soybeans to feed livestock use too much nitrogen fertilizer, which can cause a host of environmental problems. To fix them, scientists say we should eat less meat.
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The Paris climate talks are said to be the best chance in 20 years to reach a global treaty. But India argues little will change unless fossil-fuel-reliant rich countries change their habits.
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The proposal includes a nationwide cap-and-trade system beginning in 2017. China and the United States are the No. 1 and No. 2 emitters of heat-trapping carbon pollution.
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The state is often a step ahead of the status quo when it comes to environmental policy, and climate change is no exception. New legislation includes a plan to cut gasoline use in vehicles by half.