A group of five countries spearheaded by the U.S. aims to cut short-lived pollutants -- such as methane, soot and hydrofluorocarbons -- in an effort to slow global warming, and reduce lung and heart disease. Reducing levels of so-called black carbon, which are accountable for up to 40% of global warming, would also reduce global temperatures by 0.5 degrees Celsius by 2050, scientists say.

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