Energy policy

Why measuring fugitive methane emissions from shale gas production matters

  • 24 Jul 2014, 14:40
  • Mat Hope

As an ever-increasing number of countries consider exploiting their shale gas resources, and researchers scramble to understand what a production boom could mean for the climate, two new pieces of research appear to come to opposite conclusions.

What is the climate impact of shale gas?

Since gas has about half the emissions of coal when it's burned for electricity, it has been touted as  a 'bridging fuel' for countries seeking to decarbonise their economies to use as a stop gap on the way to a low carbon electricity system.

But as we've  explored before, scientists are struggling to establish the full impact of increased shale gas production on the climate, due to methane that escapes during the extraction process - known as fugitive methane emissions.

Two papers released this month examine what the actual climate impact of natural gas is. At first glance they seem to show opposite things. The graph on the left, taken from a paper by Robert Howarth appears to show natural gas electricity generation emissions - the towering left bar - can be much higher than coal's. The second graph, from  Heath et al, appears to show the opposite - that coal's generation emissions (on the left) are much higher than those from both conventional and shale gas.

Howarth Vs Heath Coal And Gas Emissions

Both papers examine the 'lifecycle emissions' of the fuels: the amount of gas emitted from extraction to combustion. So why is there such a large discrepancy between two papers?

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UK and Germany top ‘dirty 30’ league of coal plants

  • 22 Jul 2014, 16:45
  • Simon Evans

The UK and Germany are ranked joint first  - or last, depending on your perspective - in a new league table of Europe's 30 most polluting coal-fired power stations.

The ranking comes from several NGOs including WWF and the European Environmental Bureau. They're using it to argue for specific anti-coal policies, saying Europe won't meet its climate targets without them.

We take a look at what they want, and why.

Europe's biggest emitters

The NGOs have listed the EU's top 30 emitters of carbon dioxide in 2013, dubbing the contenders the "dirty 30". All of them are coal-fired power stations.

The UK and Germany both have nine coal plants on the list, putting them joint top of the league table. If you count up the emissions for each country, however, Germany comes out top because its coal plants are generally larger than the UK's and burn more coal.

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Factcheck: Do climate worriers use more electricity?

  • 18 Jul 2014, 11:00
  • Simon Evans

The Telegraph and the Mail say people concerned about climate change use more electricity than those who think the issue is too distant to worry about, according to new research.

The Telegraph quotes Conservative MP Peter Lilley:

"The survey exposes the hypocrisy of many who claim to be 'green': the greater the concern people express about global warming the less they do to reduce their energy usage."

But Lilley's strong conclusions are not supported by the study in question, which comes with some significant caveats. The researchers themselves say there's no significant effect of people's beliefs:

"None of the stated attitudes about environmental or climate change had any significant  impact on overall energy use when household age was taken into account."

Let's take a look at what the study says, and what it doesn't.

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