CINDY L. PARKER, MD, MPH, is Co-Director of the Program on Global Sustainability and Health at the Johns Hopkins University Bloomberg School of Public Health. She is also a Fellow of the American College of Preventive Medicine. She began her career as a family practice physician and, then recognized that she could help people more by by focusing on preventing health problems before they started. Climate change is, in her view, the most health-damaging problem humanity has ever faced.

STEVEN M. SHAPIRO, PhD, is a Clinical Supervisor and a Counseling Psychologist at Johns Hopkins Bayview Medical Center's Community Psychiatry Program, which provides community-based mental health services to indigent children and families in the Baltimore area. A former health and social issues journalist, who worked in that role for the American Medical Association and publications including Science Digest magazine, Shapiro has focused his writings on how to motivate people to choose healther behaviors. His many awards in journalism include the American College of Emergency Physicians Award of Excellence, the American Heart Association Howard W. Blakeslee Journalism Award, and a National Headliner Award for Outstanding News Reporting.