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@nightski Yes, natural gas is about half as bad as burning oil and one third as bad as coal in terms of energy output per tonne of CO2 emitted.

Although methane is usually the largest component, natural gas is typically a mixture of methane, propane and butane. So not quite the came as cow burps.

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Not quite. For a power plant the rate is ~0.059 tons CO2 per MMBtu of natural gas, coal is ~0.105 tons per MMBtu (different for bit, sub, etc.), and oil is around ~0.081 (although, like coal, it varies).

Now, in a power plant context, modern gas plants are going to be more efficient and have better heat rates than their coal and oil equivalents, so you do generally need less total MMBtu input to get an equivalent amount of generation out. But if you’re burning the same amount in terms of energy content, the difference when it comes to only CO2 is not as large as you’re saying.

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