Lynn Good has had many mentors throughout her career — but few of them were women. "So I'm generationally on the early part of the ascent of women into leadership roles," the Duke Energy president and CEO says. Pat Sullivan/AP hide caption

itoggle caption Pat Sullivan/AP

A view of the Tonawanda Coke plant in Tonawanda, N.Y., which was found to have emitted carcinogens at levels many times higher than the state's limit. John W. Poole/NPR hide caption

itoggle caption John W. Poole/NPR

Xiang Zhengming plants rice seedlings in a field in southeast China's Fujian Province earlier this month. A newly released report says nearly 20 percent of the country's farmland is contaminated. Lin Shanchuan/Xinhua/Landov hide caption

itoggle caption Lin Shanchuan/Xinhua/Landov

Exhausts rises from a truck in California last September. Mike Blake/Reuters/Landov hide caption

itoggle caption Mike Blake/Reuters/Landov

Researchers have found that the oft-maligned banana peel can grab heavy metals out of polluted water. iStockphoto.com hide caption

itoggle caption iStockphoto.com