The struggle to preserve and improve human and environmental health is meaningful and valuable. The role of public health scientists is to assemble and analyse evidence, leading, if possible, to proof of the health effects of environmental and occupational exposure. At the same time, it is the duty of the political superstructure to replace dangerous agents with substances that are safer, if possible eliminating all health risks entirely. Ideally, it is in this context that epidemiological research of environmental and occupational health problems should be conducted.The discipline of public health is to investigate, comprehend and, as far as is possible, explain fully the causes, mechanisms and consequences of such hazards, and to develop and implement solutions such as preventive programmes, political initiatives and advocacy. The pursuit of sustainable development requires the construction of necessary social bodies and administrative mechanisms. Policies and academic studies that facilitate minimal environmental damage with maximum efficiency are required. This chapter describes ways by which workplace and environmental health epidemiology can be used to improve public health and create a more habitable world for future generations. The chapter has a particular focus on Turkey, with a limited discussion of these issues in other developing countries.