Sarah Gardner
Reporter
Sustainability
Exhaust rises from the main chimneys of a coal-fired power plant.
Sean Gallup / Getty Images
Sustainability
A green Wal-Mart sem-trailer truck
Getty Images
Economy
President Franklin Delano Roosevelt, pictured here in a 1932 "whistle stop" in Maryland, was the first of a string of chief executives to advocate for a consumer economy to raise wealth.
Library of Congress