In the 30 years that physicist David B. Goldstein has worked at NRDC, he has had countless opportunities to ponder the relationship between the environment and the economy. His groundbreaking work improving the efficiency of appliances (most notably energy-guzzling refrigerators) helped him earn a prestigious MacArthur Foundation fellowship in 2002. Since then, Goldstein has continued to learn firsthand how environmental innovations can boost a company's bottom line. In his new book, Saving Energy, Growing Jobs (Bay Tree Publishing, $18.95), Goldstein explains the social and economic benefits of a more efficient, sustainable economy, drawing on examples from the hard-nosed world of business. Innovation, competition, and growth, Goldstein argues, are the core principles of this more enlightened economic model and a basis for the political alliances necessary to achieve it.