Environmental health remains at the periphery of sustainable development for a number of reasons. It is inadequately defined, rarely quantified, and institutionally fragmented. 'Environmental Health' helps fill a void in economic development thinking. It provides procedures to address multisectoral problems that require multisectoral solutions. It addresses those problems by: - proposing a new approach to targeted collaboration among different sectors; - devising new tools or enhancing existing ones to help different sectors contribute to the alleviation of health problems; and - putting theory into practice through a pilot in Ghana.