Even when changes such as in climate are inevitable, measures that slow the changes are desirable because adaptation is usually much more feasible over longer time periods. The imple- mentation of tie-in strategies requires some degree of incentive beyond normal market forces and, therefore, is opposed by some on ideological grounds. A good example is opposition to mandatory fuel mileage standards for automobiles. Although free market purists tend to oppose measures such as fuel mileage standards, a market that does not factor in environmental costs is not truly a free market