This Just In
Alternative power, from sunlight to human muscle tops out this week's gallery.
Battery-powered engine-and-prop unit can drop into water with a range of 32 miles.
The modern-day windmill is part energy icon, part tourist attraction and part residential building.
Cloud Cast emits a cool mist over individual humans, instead of cooling an entire plaza.
Glass-paneled walls filled with water absorb heat during hot spells and distribute it during cold snaps.
Massachusetts wins top marks for energy efficiency in an energy contest between the Patriots and Seahawks.
The by-product is clean water and electricity.
Hydrogen, the most common element in the universe, is taking big steps forward as a clean fuel source. Here are some facts about the ubiquitous gas.
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