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A policy is assumed to be optimal if marginal abatement costs are equalized across countries, thereby minimizing total costs.
An opportunity is a situation or circumstance to decrease the gap between the market potential of any technology or practice and the economic potential, socio-economic potential, or technological potential.
Opportunity cost is the cost of an economic activity forgone by the choice of another activity.
Ozone, the triatomic form of oxygen (O3), is a gaseous atmospheric constituent. In the troposphere it is created both naturally and by photochemical reactions involving gases resulting from human activities (smog). Tropospheric ozone acts as a greenhouse gas. In the stratosphere it is created by the interaction between solar ultraviolet radiation and molecular oxygen (O2). Stratospheric ozone plays a decisive role in the stratospheric radiative balance. Its concentration is highest in the ozone layer.
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