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RSS FeedsFlyover study suggests oilsands emissions could be 30 per cent higher than reported
(The Star Toronto Raptors)

 
 

10 may 2019 07:03:20

 
Flyover study suggests oilsands emissions could be 30 per cent higher than reported
(The Star Toronto Raptors)
 


CALGARY—A series of airborne tests over the Athabasca oilsands region found a surprising amount of carbon dioxide drifting from oil-and-gas facilities in the region, calling into question the certainty of conventional emissions data.A small team of scientists collected the data between August and September 2013, flying aircraft covered in sensors 13 times through the heartland of Canada’s oilsands. After years of analysis and review, the team concluded that oilsands operations emitted roughly 30 per cent more carbon dioxide than what is reported to authorities. For surface mining facilities, it was closer to 64 per cent.The authors of the resulting study, published in Nature Communications last month, say the unaccounted-for CO2 totals roughly 17 megatonnes a year — the equivalent of all greenhouse-gas emissions from a metropolitan area the size of Toronto or Seattle.“I didn’t expect the difference to be that big,” said John Liggio, one of the study’s authors and a research scientist with Environment and Climate Change Canada’s air-quality research division. The “top-down” method used by the study is quite different from how oil companies track emissions. The typical “bottom-up” method relies on sensors in the stacks of major oil facilities and factors in fuel consumption based on calculations recognized by the United Nations.Furthermore, the airborne tests didn’t just pick up CO2 and other emissions from the plants themselves; the sensors also picked up emissions from surface mines and even tailings ponds.The CO2 measurement method sanctioned by the United Nations Framework Convention on Climate Change (UNFCCC) is almost universally considered the best possible way to calculate emissions totals. Yet the study’s authors said the differences between their findings and emissions reported via the UNFCCC method are significant.“Given the similarity in bottom-up reporting method ...


 
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