Just in time for Earth Day comes this wide-ranging look at global climate change, which answers common questions and introduces people and organizations from around the world who are doing something about it. The first section defines the problem, explains how we know it’s happening and responds to common arguments. Complex ideas are conveyed in a light, conversational manner, and the narrative is punctuated with interesting, appropriate quotations as well as interviews with a wide variety of scientists. The second section describes specific “Gaia Warriors”—individuals and groups working to change our ways. Davies describes a wide variety of campaigns—many by young people—especially in the areas of transportation, food, homes, clothing, deforestation and the intersection of climate change and human rights. She addresses some controversies, including the use of biofuels and nuclear power and the utility of carbon dioxide offsets. The trendy, magazine-like design of this English import will appeal to younger teen readers, who are encouraged throughout the book to visit specific websites for further information. First published in England in 2009, the information about world negotiations has been updated to include the results of the Copenhagen meeting that spring. One could quibble with the weight given various topics, but overall this is an enjoyable and comprehensive summary marred only by its complete lack of documentation. (afterword, more resources, glossary, index) (Nonfiction. 12-16)