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I think there's something in this...

The person behind the cash register could even ask, "Would you like to make your 'gas/petrol/fuel' today carbon-neutral for an extra $2.45?".

I can see that working with very little capital. It gets sold the same way as the Snickers bars next to the checkout.

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A lot of gas stations here ask "Do you want a car wash for $x.xx" directly on the gas pump after you slide your card. If gas stations just added "Do you want carbon neutral for $x.xx" I think many would push yes in the right markets and a reasonable $x.xx value.

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