I meant that, when you sell, say, papers for the use of a billion tons of CO2 because that is the most that we can use without ruining the climate, and then someone buys a thousand, uses a thousand tons of CO2 in half a year and sells his paper to someone else, who then uses a thousand tons as well, and there are no checks or controls, then we may end up using two billion tons a year because the same papers are reused. Which is obviously not the idea I had in mind. The idea was just to create a market and artificially limit the "resource" 'CO2 output' so that people can't use it willy nilly and think about how much of it they want to use/can afford. The invisible hand of the market will then make sure putting CO2 into the air has the right price. The limit would obviously be based on the natural law of how much CO2 output nature can handle, so if companies plant lots of trees, they can buy more CO2 output in the future. You could also tax the living whatever out of fossil fuels, but that would be evil government interference and still not necessarily limit use to a level the planet can handle.
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