The links between environmental conditions and human welfare are strong and complex. For many people environmental resources provide their basic sustenance. Wise sustainable use of these resources can provide the basis for growth and poverty reduction. Millions more, who do not depend directly on the environment for their livelihood, are affected by environmental degradation.
Diseases associated with environmental factors are highly concentrated among the poor.
Water and Sanitation Lack of clean water and sanitation is the main reason disease transmitted by feces are so common in developing countries. Contaminated drinking water and an inadequate supply of water cause diseases that account for 10 percent of the total burden of disease in developing countries. World Bank, World Development Indicators 2001 . And in Sub-Saharan Africa fewer than half the population has access. In Accra, Ghana, water consumption per capita is three times higher for the one-third of people living in the richest areas compared to those living in the poorest areas.