Tesla CEO makes promise on Twitter to Australian billionaire Mike Cannon-Brookes.
The solar cells recycle carbon dioxide into fuel using sunlight.
Writing for Newsweek, André Borschberg and Bertrand Piccard reflect on their journey.
The experimental aircraft landed in Seville on Thursday morning.
The Solar Impulse 2 stops at JFK airport during historic bid to navigate the globe without any fuel.
New study finds the planet could transition away from fossil fuels in 10 years if the right measures are put in place.
Researchers studied moths's eyes to create the most light-absorbent material ever created.
If saving the planet doesn't make you switch to solar, maybe the price will.
"Climate change is real. The time for talk is passed. The time for action is now."
From lighting your television screen to sterilizing polluted water, how the new Nobel laureates' inventions can change the world
Texans choose green energy more often than other consumers, report finds