Following are illustrative numbers indicating benefits and costs to Country A of taking specific actions on an international treaty to reduce CO₂ emissions. The choice is either to adhere to the CO₂ emissions cutbacks called for by the treaty or to disregard the treaty.

What is the incentive for Country A to free ride on the abatement efforts of other countries? If all countries become free riders, what is the result?

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All countries adhere to treaty No countries adhere to treaty Other countries adhere to treaty, Country A does not Costs 10 0 0 Benefits 20 -5 19 Net Benefits 10 -5 19