After being decimated by disease, pollution, and overharvesting, the Chesapeake Bay’s renowned oysters are thriving once again, thanks largely to a selectively bred oyster that grows rapidly and is more resistant to pathogens.
In a Nairobi, Kenya, slum, residents used technology to map the area, a key first step in solving problems from waste removal to street lighting. Those with phones can now report problems more accurately.
Environmentalist Ma Jun built a mobile phone app that lets users see whether a Chinese factory or power plant is violating pollution standards. His efforts won him a $1.25 million prize from the Skoll World Forum on Entrepreneurship.