One reason it is difficult to coordinate the reduction of greenhouse gases is that

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Abatement is considered a public good because the benefits of reducing greenhouse gases are shared globally, regardless of who pays for the abatement. This creates a coordination problem, as individual countries or entities may hesitate to bear the costs of abatement when they cannot exclusively capture the benefits, leading to a situation known as the "free rider" problem.

One Reason It Is Difficult to Coordinate the Reduction of Greenhouse