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    MARCIO JOSE SANCHEZ/Associated Press
    Fog rolls over the Altamont Landfill owned by Waste Management in Livermore, Calif. Altamont is one of two California landfills making liquefied natural gas. Other natural gas facilities are being planned by Waste Management at some of the 270 active landfills nationwide.
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    MARCIO JOSE SANCHEZ/Associated Press
    A tractor sorts garbage at the Altamont Landfill. Dotted throughout the facility are more than 100 wells with black tubes that vacuum up methane from the heap.
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    MARCIO JOSE SANCHEZ/Associated Press
    Mike Beckman, Vice President of Alternative Energy for Linde, walks along a fence next to a plant which produces liquid natural gas at the landfill.
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    MARCIO JOSE SANCHEZ/Associated Press
    Landfill manager Jessica Jones points to a pump which brings up methane gas created by the garbage.
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    MARCIO JOSE SANCHEZ/Associated Press
    Mike Keele puts on rubber gloves as he readies to fill a garbage truck with liquid natural gas at the Waste Management offices in Oakland, Calif.
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    MARCIO JOSE SANCHEZ/Associated Press
    Keele pumps liquid natural gas into a garbage truck. Almost 500 Waste Management garbage and recycling trucks run on this new source of environmentally friendly fuel instead of diesel fuel.
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    MARCIO JOSE SANCHEZ/Associated Press
    Waste Management employee Jim McNally collects garbage on a truck fueled by liquid natural gas in Castro Valley, Calif.
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    MARCIO JOSE SANCHEZ/Associated Press
    McNally talks about operating a garbage truck which runs on liquid natural gas at the Waste Management offices in Oakland.