Environmental degradation is associated with increased morbidity and mortality and decreased productivity. Urban and indoor air pollution; inadequate water supply, sanitation, and hygiene; natural disasters (mainly floods and landslides); and land degradation are the environmental problems associated with the highest social and economic costs, falling most heavily on vulnerable people, especially poor children under five years old. This book begins by exploring institutional change and environmental priorities in Colombia over the past 50 years, a time of substantial progress in environmental protection and rapid transition from a largely rural to a highly urbanised economy. Part 2 assesses the burden of disease rooted in inadequate water supply, sanitation, and hygiene; poor air quality; and natural disasters; and the environmental management practices to reduce that burden. A discussion of the environmental costs of rapid and unplanned urbanisation is also included. Part 3 assesses the sustainable management of Colombia's rich endowment of natural resources.