When is the right time to replace an old refrigerator? Is it okay to knit a sweater with acrylic yarn? Is it more environmentally correct to buy beer in bottles or cans? For the last several years, Bob Schildgen's popular "Hey Mr. Green" column has tackled real-world questions from real people. Readers trust his answers, which are backed by Sierra Club's research, but they also enjoy his realism and irreverent humor. This book distills the best of the column into one enormously useful and entertaining resource. It's organized by subject -- household issues, food and drink, transportation, reuse and recycling, and "big picture" environmental questions -- making it easy to find answers to common questions. Whether puzzling over the intricacies of product life cycles or taking a reader to task for blasting his air conditioner, "Hey Mr. Green" is an indispensable, opinionated, and authoritative guide to minding one's environmental footprint.