Weather is changing, all around the world. Temperatures are higher, hurricanes are fiercer, droughts are more devastating, and floods are more widespread than ever before. Many of the world's finest scientists are studying our extreme weather today, in hopes of predicting how climate change will affect our future. Read about El Nino, greenhouse gases, the growing ozone hole, and global warming. Meet the scientists doing the most current research and see how modern technology helps them to do their work - work that is vitally important to the survival of our planet."National Geographic Investigates" introduces young people to cutting edge techniques of scientific investigation, the most current discoveries, and the way that those discoveries are interpreted to throw new light on our understanding of ourselves and the world around us. Special features include: map showing major sites discussed in the book, plus locator maps to start each chapter; sidebars explaining the latest technology being used by scientists; a 'Meet the Expert' sidebar presenting an interview with a scientist currently working in the appropriate field; timelines placing research and researchers in historical context and pinpointing the time period for each chapter; and, lavish design including photographs, illustrations, and diagrams.