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Water-Cleaning Technology to Help Farmers

The giant solar receiver installed on a wheat field here in California's agricultural heartland slowly rotates to track the sun and capture its energy. The 377-foot array, however, does not generate electricity but instead creates heat used to desalinate water. It is part of a project developed by a San Francisco area start-up called WaterFX that is tapping an abundant, if contaminated, resource in this parched region: the billions of gallons of water that lie just below the surface.

Drones From Iran Actually Built to Save People - From Drowning

Another example of how a drone can be a lifesaver, rather than a killer, comes from a group of young engineers in Iran whose robotics expertise has been put to work developing an alternative to human lifeguards along the Caspian Sea coast, where more than a thousand people drown every year. Their drone can speedily fly to swimmers in trouble and drop three life preservers.

40 Victories Since the First Earth Day: 40th Anniversary Timeline

Since the first Earth Day 40 years ago, America has become a cleaner, safer, more beautiful place with less pollution, more pristine rivers, fewer people littering, and many endangered species rescued from the brink. Here are 40 successes in 40 years since the first Earth Day -- an anniversary timeline.