To keep track of the flurry of figures being bandied about when it comes to the efforts expected of each sector in tackling climate change, we need to move away from percentages. This means becoming familiar with a new metric: million tonnes of carbon dioxide equivalent (MtCO2e). MtCO2e is the currency allowing us to measure on a single scale the global warming potential of various gases (CO2 from the combustion of fossil fuels, methane from livestock, etc.). Just like the Exchequer budget is defined in millions of euros, and the government “only has a certain amount of money”, to parrot…

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