In many instances, environment and health requirements are complementary. Both can gain greater recognition thanks to comprehensive approaches that span the health, natural resources and economic benefits of environmental investments. For instance, the World Bank applied cost-benefit analysis to air pollution control investments in a cement factory in Estonia. Although the health benefits of these investments were significant, the largest share of estimated environmental benefits had no bearing on health. Only by combining health and non-health benefits could the investments be justified by the cost-benefit analysis.