10 Gadgets Trying to Save the World

Forget Bluetooth-enabled toothbrushes and sensor-laden egg trays. The smartest smart gadgets may be the ones that are trying to save the world--or at least lower your energy bills. Here, we rank 10 of the most compelling contributions

This appears in the July 07, 2014 issue of TIME.

Your browser is out of date. Please update your browser at http://update.microsoft.com