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Personal CO2 quotas.
The whole idea of a personal carbon footprint came from BP as a strategy to shift the blame on carbon emissions onto the individual. While it is definitely useful to have an idea of what is bad for the environment and what you can do to lower personal emissions, things like taxation at point of emissions, and other larger systematic changes are what's required.
I'm aware this opinion isn't particularly helpful, nor am I trying to discourage people having a sense of responsibility about their effect on the environment, but forcing those with limited means to make ecologically conscious decisions seems like an unfair burden.
I am obviously superior to people with kids. But that's mostly down to your house smelling of used diapers and microwave meals, whilst my place smells of merlot and tinder dates.
However, following on from DJ's point, can I claim the CO2 quota of my unborn children? If so I will continue to fly long haul all over the place.