Our environment is constantly changing. Some of these changes are caused by natural events, such as volcanic eruptions. Others are caused by humans, like oil spills. Yet other events are a combination of nature and people's actions. Read about some major events that have had an impact on our world. The Insights series offers a range of books on popular topics that are always in demand. Each book provides an informative overview of an aspect of Australian history, culture, environment and people. Features of the books include comprehensive text, contemporary and historical photographs, illustrations and maps, resource lists for further information, glossaries and indexes.