If you were to take a flight from India to the United States, to which country would the carbon emissions produced be attributed to? To India, since that’s where the flight took off? An equal split between the two countries? Or to all the countries along the route that the flight takes?

This is not just a hypothetical question. It matters, because it informs graphs like this:

And these graphs are in turn important, because they tell us where the clock on the metaphorical time bomb of climate doom stands. They determine the targets that each country needs to achieve to keep temperature rise below 2 degrees.

So which country is it? The answer is … drumroll …

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