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Showing posts from December, 2019

National greenhouse gas reporting needs an overhaul – it's time to directly measure the atmosphere

Junk Culture / shutterstock How much greenhouse gas is emitted by any individual country? With global emissions of carbon dioxide hitting a record of 36.8 billion tonnes this year, and delegates gathering in Madrid for the latest UN climate talks , it’s a pressing question. One might assume that we know precisely how much is emitted by any given country, and that such figures are rigorously cross-checked and scrutinised. And in some respects, this is true – countries are required to report their emissions to the UN , based on exhaustive guidelines and with reams of supporting data. Yet these reports are based on what are known as inventory (or “bottom-up”) methods. To simplify, this means that governments figure out how much greenhouse gas is emitted by a typical car, cow, or coal plant, and then add up all the cows, cars and so on to get an overall emissions figure. Map showing the UK’s CO2 emissions, calculated using ‘bottom-up’ methods. Daniel Hoare, Universi