With more than $3.7 billion in assets and annual revenue of $800 million, the Nature Conservancy has generated staggering growth that would be the envy of any business. Incorporated in 1951 by a small circle of concerned ecologists, the Conservancy has grown financially into the world's largest environmental organization. It has one million members--up from 500,000 in 1990--and 3,500 employees operating in 50 states and 28 countries across the world...