17 May 2018

Gas leaks are bad news for efforts to reduce GHG emissions

I learned about the problem of unmeasured leaks magnifying the negative impacts of natural gas a few years ago. This 2013 article explains the problem:
The gulf between the official numbers and the Cornell estimates wasn’t a surprise to some. John Bosch oversaw emissions estimates for the EPA for more than 30 years before retiring in 2009. Emissions estimates were based on voluntary participation from industry, and only companies with good leak management programs volunteered. “My experience is that when regulators start looking at actual emissions the figure can easily double,” says Bosch. In fact, when real measurements are taken, the difference sometimes turns out to be even greater than that. In 1988, one oil refinery in Sweden recorded gas emissions that were 20 times higher than official estimates for the same facility. More recent data from natural gas processing plants in Canada put emissions at between four and eight times official levels.

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