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Natural gas is the cleanest burning fossil fuel , producing mostly just water vapor and carbon dioxide.
It is made from plant products, not fossil fuel , which means it is renewable.
Natural gas is a clean alternative to oil, although it's also a fossil fuel and has its own problems.
The fossil fuel burned by a passing car becomes a Palaeolithic thought bubble in the present.
Otherwise, the only fossil fuel they consume is the paraffin they put in their lamps.
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