This book lists 50 ways you can make your life greener. Readers who are already convinced of the need to act ecologically will be its best audience. The ideas are useful, if not deeply innovative. Most of them will indeed help the environment and save you money. And thatâs a good thing. However, author David Bach (writing with Hillary Rosner) uses many semi-statistical claims without giving enough data or context to lend meaning to his numbers, though they may still encourage true environmental action believers. Some of the bookâs statistical conclusions are based on fairly unrealistic extrapolations of averages. For example, saying that the average family works two to four months out of the year to drive, insure, fuel and maintain its cars does not seem to capture the fiscal realities and practical options truly available to such families. Bachâs real message, of course, is to drive thoughtfully, save money and go easy on the planet, so getAbstract suggests focusing on the good to be done, and being a little forgiving about the math.