Stabilizing greenhouse gas concentrations at 550 ppm -- which would invoke a rise in temperature of about three degrees Celsius -- would require energy emissions to rise no higher than 33 gigatons and would need to fall in the longer term.

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In time they buried some 380, 000 miles of pipelines throughout the United States, which now handle 63 billion cubic feet of natural gas and 20 million barrels of crude a day, removing a crucial variable from the supply chain and stabilizing markets.

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