The restoration's goal is to put as much of the Kissimmee as possible back to the way it was. This photo shows the river after restoration. Courtesy the South Florida Water Management District hide caption

itoggle caption Courtesy the South Florida Water Management District

Researchers say there's plenty the beef industry can do to use less land and water and emit fewer greenhouse gas emissions. But producers may need to charge a premium to make those changes. iStockphoto.com hide caption

itoggle caption iStockphoto.com

Corn farmer Jerry McCulley sprays the weedkiller glyphosate across his cornfield in Auburn, Ill., in 2010. An increasing number of weeds have now evolved resistance to the chemical. Seth Perlman/AP hide caption

itoggle caption Seth Perlman/AP

Millennials seem to prioritize the environment, but may want to dissociate from the "treehugger" baggage of the term "environmentalist." Getty Images hide caption

itoggle caption Getty Images

Cindy Minnix waits for a bus in a flooded street on Oct. 18, 2012, in Miami Beach. A changing climate is making floods related to high tides more frequent, scientists say. Joe Raedle/Getty Images hide caption

itoggle caption Joe Raedle/Getty Images

Pine nuts aren't farmed; they're harvested from forests. The nuts are hidden inside the cones of certain species of pine, such as this pinyon in Utah's Fishlake National Forest. Scott Smith/Corbis hide caption

itoggle caption Scott Smith/Corbis

Yoram Bauman jokes about "hyperinflation in hell" and on earth. Case in point: the Zimbabwe hundred-trillion-dollar note. Lejia Lombardi/Courtesy of Inter-American Development Bank hide caption

itoggle caption Lejia Lombardi/Courtesy of Inter-American Development Bank