The U.S. could significantly curb its carbon emissions by using more natural gas instead of coal and other fuel sources, said Lamar McKay, chairman and president of BP Americas. If the country could boost its natural gas consumption by 1 trillion cubic feet annually, "we could retire 150 gigawatt hours of the oldest and dirtiest coal-fired plants," McKay said at a conference. Up to 30% of the carbon emission targets under the House-approved Waxman-Markey legislation could be achieved by increasing natural gas usage, according to BP.

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