“Only when the last tree has died, the last river been poisoned, and the last fish been caught, will we realize we cannot eat money.” -- A Cree Tribe Proverb from 350 years ago. In 1762, after coal was discovered, Pittsburgh began to be known as the “Smoky City” or as “Hell with the Lid Off.” Still there were people who believed the smoke was good for their lungs and helped crops grow. In the spring of 1962, Rachel Carson’s book Silent Spring sold more than 500,000 copies in 24 countries,