The aim of this book is to address the major environmental issues at global to regional scales. It is prepared to inform undergraduate students on the basic concept and principles underlying environmental problems. The book is entitled with environmental sciences and Environmental impact assessment. It covers highlights of the environment and scopes of environmental science, major environmental issues, the planet Earth, Earth's atmosphere: air pollution, green house effect, global warming, acid precipitation, the Hydrosphere: water use, water pollution, sources of water pollution, major pollutants waste-water treatment, the Lithospheres: Soil pollution, types of soil pollutants, solid waste management source and types of solid wastes, waste management and disposal for sustainable development. Environmental Impact Assessment systems.EIA in the world today, planning an effective EIA study, preliminary assessments, EIA and stakeholder involvement, impact identification, predication and evaluation; impact mitigation and monitoring, EIA reports EIA review, decision-making and auditing.