M.C. Davis, former gambler and businessman, stands in his 54,000-acre preserve, Nokuse Plantation, in the Florida Panhandle. It's the largest privately owned conservation area in the southeastern United States.
A tray of sardines in Costa Mesa, California, in this November 17, 2014 photo. Plummeting sardine populations force a complete ban on sardine fishing off the U.S. West Coast for more than a year.
LUCY NICHOLSON/Reuters /Landov
A baby orangutan wearing a diaper swings through the trees at the Sumatran Orangutan Conservation Program outside Medan, capital of Indonesia's North Sumatra province. The program takes mostly orphaned orangutans, nurses them back to health and releases them back into the wild.
Volunteer Tom Strain carries debris from an empty lot as part of an Earth Day cleanup effort in Camden, N.J. The Earth Day events celebrated on April 22 promote a sustainable and clean environment.