GUESTS: Roger Pielke, Sr. Professor, Atmospheric Sciences Colorado State University Fort Collins, Colorado Randall Cerveny Associate Professor, Geography Arizona State University Tempe, Arizona Lisa Leff Portfolio Manager Director, Social Investment Salomon Smith Barney New York, New York Ray Anderson Co-chair, President's Council on Sustainable Development Chairman and CEO Interface, Inc. Atlanta, Georgia A new study finds that air pollution drifting off the east coast is linked to weekend rain along the Atlantic seaboard. Another report says that land use in Colorado is altering local climate. In this hour, we'll take a look at how humans are changing the weather. Plus, is what's good for the environment good for business?