An introduction to the key environmental issues presently threatening our global environment. Explanations of the evolution of the Earth's natural systems (hydrosphere, biosphere, geosphere, ecosphere) provide an understanding of the scientific concepts, processes and historical background behind key environmental issues. Contemporary socio-economic, cultural and political considerations are explored and important conceptual approaches such as Gaian hypotheses and Chaos theory are introduced. Human impact and management of the natural environment, and concerns for maintaining biodiversity are emphasized throughout the text.