An existing agreement on clean fuels technology, which includes coal-to-liquids and hydrogen, was discussed but an extension of that pact was not needed, DOE said.

能源部说，双方讨论了有关原煤液化和氢气在内的清洁燃料技术的现有协议，但该协议无需展期。

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This covers solar thin-films, biofuels, coal-to-liquids, shale gas and smart grids, all with U.S. partners.

这些技术涵盖了太阳能超薄薄膜、生物燃料、煤制油、页岩气和智能电网，全部都有美国伙伴的参与。

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Shenhua and Shell last month signed a Memorandum of Understanding for a coal-to-liquids project.

上个月，神华和壳牌签订了合作谅解备忘录。

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What is interesting is that the conversions of biomass (e.g. switchgrass and salicornia) to synthetic diesel using Fischer-Tropsch (F-T.) and coal to liquids with F.

FORBES: Land Use Changes Are Main Factor In Carbon Emissions From Biofuels

The category includes petroleum, natural gas liquids, ethanol, biodiesel, coal-to-liquids and gas-to-liquids, and as you can see, the gap narrows between liquids and coal, but coal remains the second energy source to power the world.

FORBES: Big Demand-Supply Mismatch Argues For Higher Oil Prices

Long before we run out of the cheapest shale oils that are now fueling the current American oil boom, and long before bio-engineers convince bacteria to excrete oil, hydrocarbon engineers will perfect cheap coal-to-liquids. (For a measured technical exploration of all this, see the National Academy of Sciences report.) The latter will unleash another boom.

FORBES: The International Energy Agency Catches Up With America's Oil Producers