This title examines one of the world's critical issues, the loss of biodiversity. Readers will learn the historical background of this issue leading up to its current and future impact on society. The evolution of new species, speciation, and extinction are discussed in detail, as well as types of biodiversity and biological examples of each. Also covered are causes of extinction, such as natural catastrophes, over hunting, over harvesting, habitat loss, and global warming, and the preservation measures, conservation organizations, and legislation intended to slow down and control the loss of biodiversity. Engaging text, informative sidebars, and color photographs present information realistically, leaving readers with a thorough, honest interpretation of the loss of biodiversity. Features include a timeline, facts, additional resources, Web sites, a glossary, a bibliography, and an index. Essential Issues is a series in Essential Library, an imprint of ABDO Publishing Company.