Answers

2016-01-15T16:37:36+05:30
They are fuels that have a lower carbon intensity than the standard for the fuel it replace.
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2016-01-15T16:40:50+05:30
Clean fuels are those fuels . Natural gases are called clean fuels because it does not emit poisinous gases on burning. . T can easily be transported through a network of underground pipelines. . It has a high calorific value. . Complete combustion takes place here.
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meaning of first sentence !!??