Diatoms are microscopic algae which are found in virtually every habitat where water is present. This volume is an up-to-date summary of the expanding field of their uses in environmental and earth sciences. Their abundance and wide distribution, and their well-preserved, glass-like walls make them ideal tools for a wide range of applications as both fossils and living organisms. The major emphasis is on their use in analyzing ecological problems such as climate change, acidification and eutrophication. This book should be read by environmental scientists, phycologists, limnologists, ecologists and paleoecologists, oceanographers, archeologists and forensic scientists.