Environmental impact assessments usually identify mitigation measures to potential problems. It is desirable to identify levels of acceptable risk, or state of biodiversity that is considered undesirable. Such limits could be either expressed in biological terms (e.g. percentage of biomass below which a given species should not be driven) or in economic terms (e.g. minimum profitability from tourism or fisheries).
Decision-makers and users of biological resources should be guided by economic approaches which assess the full social and environmental costs and benefits of projects, plans and policies that impact upon biodiversity, and which internalise costs borne to the environment and to society. These should reflect both the economic loss that results when biodiversity is degraded or lost, as well as the value gained from conserving the resource.