In “Let’s Get Small,” Judith Lewis writes that “global greenhouse gas emissions have increased 70 percent since 1970, and our energy-squandering ways are to blame” (HCN, 6/22 & 7/6/09). Note that since 1970, world population has increased from around 3.8 to 6.7 billion people, while the United States has gone from 200 to over 300 […]