But these days it's leaning more toward clean diesel engines that get high mileage and can run on newly popular fuels like gas-to-liquid synthetic diesel or biodiesel.
Mr Kloppers said the writedown on the Fayetteville assets was also a reflection of BHP's decision to change course and shift drilling from dry gas to liquid-rich fields.
And earlier this month, Airbus, in association with Shell, Rolls Royce and Qatar Airways, began a research project to test 'Gas to Liquid' (GTL) technologies that convert lower-emission natural gas and other synthetic fuels into liquid kerosene.
Meanwhile, New England plans to import natural gas supplies from foreign markets and has started construction on nearly a dozen shipping terminals for liquid natural-gas imports.
In July 2012 Humala introduced a program to provide low-income Peruvians with discounted electricity and free liquid-natural-gas powered cooking stoves.
This will generate two flashes of light - one in the liquid argon and another in the gas - which will be detected by the receptors.
BBC: Dark Matter: Experiment to shed light on dark particles
The accident helped prompt a national debate over the adequacy of federal regulations for the nation's sprawling, 2.6-million-mile network of gas and hazardous liquid pipelines.
This has encouraged gas producers to scurry after oil in liquid-rich shale beds such as the Bakken in North Dakota.
Buyers are suffering from gas-price sticker shock and are sitting on liquid assets until they get a better fix on where the economy is actually going.
It said some of the gas - which is used in the site's cooling systems - may have turned into liquid as the fire service used water to prevent it dispersing.
But the gas-seals would be perfect if the pistons were liquid rather than solid.
As for the Mining Boom III, the pick up in export volumes flowing from the surge in mining investment in iron ore, coal and liquid natural gas will start to get underway around 2014-15.
Cox believes that all in all--transformation, transportation, refining--he can make liquid fuels more cheaply by turning natural gas into GTL than can producers that start by extracting crude oil.
In the 1970s and 1980s the federal government poured billions of dollars into the Synthetic Fuels Corporation to develop liquid and gas fuel from coal, and into the fast-breeder nuclear reactor.
Mr Keiller said profits had been boosted by the company's involvement in unconventional energy such as shale gas industry in North America and he saw further opportunities in the liquid-rich area which had not been impacted by recent price falls.
Fracking uses high-pressure liquid pumped deep underground to fracture shale rock and release gas.
BBC: Fracking firm Cuadrilla plans new well at St Annes site
Post-combustion, CO2 is removed from flue gas by passing it through a liquid amine which dissolves the CO2.
First and foremost, the boom depends on a free, liquid, competitive market in gas, underpinned by an extensive and well-regulated pipeline network.
Households with oil-fired central heating, and those using solid fuel or liquid petroleum gas to heat their homes, are much more likely to be in fuel poverty than "on-grid" households.
In Yerevan, Armenia, where I was last May, I noticed buses and lorries resplendent with rusty-looking cylinders of gas as their fuel supply, which is more cheaply obtained than liquid fuels, but I emphasise that it is petroleum gas (mainly propane and butane) that is used there and not biogas.
FORBES: U.K. Joins Europe On Biogas 'Waste Into Energy' Strategy
There are a number of different reactors in use, most commonly water-cooled pressurised or boiling water reactors - though other reactor types are kept cool with the help of liquid metal, gas or molten salt.
Calgary-based Inter Pipeline is in the business of petroleum transportation, bulk liquid storage, and natural gas liquids extraction.
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