Environment has become a central issue in the present day world. Environmental sustainability has been advocated as a major goal to deal with growing problems of pollution that threaten the very existence of the human beings. The dismal picture of global warming brings to the attention the necessity of environmental performance so that the governments in the world can take positive steps toward sustainability. The book uses the data from the Yale Center for Environment and Policy. It uses Environmental Performance Index (EPI) prepared by the Yale Center. The book explores the relationship between environmental performance and democracy, ideology, leadership, good governance, participation in international agreements, economic factors, and globalization.