Natural gas the next ‘green hope’
"In North America, four factors promise to make natural gas a viable alternative to oil-based fuels.
First, revolutionary technology is unlocking enormous new supplies of shale gas.
Second, unrest in North Africa and the Middle East has underlined U.S. oil-supply vulnerability.
Third, there are clear environmental advantages to clean-burning natural gas (which emits 25 per cent less carbon dioxide than diesel).
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Fourth, there have been major advances in natural gas fuel technology."