‘Natural gas not climate-friendly’

Study counters earlier claims; natural gas is a bridge to nowhere, says Robert W Howarth, ecologist and methane expert

 
Last Updated: Saturday 04 July 2015

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Shale gas and the conventional natural gas are often promoted as the "bridge fuel" to allow people to continue using fossil fuels, such as coal and oil, the major cause of greenhouse gas emissions, over the coming decades. However, natural gas has larger green house gas emissions than coal or oil, says a study, titled ‘A bridge to nowhere: methane emissions and the greenhouse gas footprint of natural gas’. The push to use more natural gas to heat homes and water may be wrong because natural gas is “not a climate friendly fuel for these uses.”

The study states that methane emissions from shale gas are most likely 50 per cent more than from conventional natural gas. It also states that methane emissions contribute significantly to green house gases for both shale gas and conventional gas, particularly when analysed over the timescale of 20 years following emission. At this shorter timescale, which is highly relevant to the concept of natural gas as a bridge or transitional fuel over the next two to three decades, shale gas appeared to have the largest greenhouse warming consequences of any fossil fuel.

The temperature of the Earth continues to rise at an alarming rate. “Climate scientists tell us we may reach dangerous tipping points in the climate system within just a few decades,” says the study.

Even if the world eliminated carbon emissions tomorrow but ignored methane, the planet would still warm to the dangerous 1.5 to 2 degree Celsius threshold within 15 to 35 years, says Robert W Howarth, ecologist and methane expert, in the study. “By reducing methane emissions, society buys some critical decades of lower temperatures,” his study says.

It’s not that the world should continue using coal and oil, says Howarth. “Society needs to wean itself from the addiction to fossil fuels as quickly as possible. We should embrace technologies of the 21st Century and convert our energy systems to ones that rely on wind, solar, and water power,” he adds.

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