Taking one flight emits more CO2 than poorer people emit in a year.

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 Aviation starkly demonstrates the difference between rich and poor. Taking a long-haul flight generates more carbon emissions than the average person in dozens of countries produces in a whole year.

Even a short-haul flight - say London to Edinburgh - will emit more CO2 than the average person in Uganda or Somalia does in a year.

But, it's the poor who will suffer the most from the resulting environmental damage.