The trans-America bid is the first attempt of its kind with a zero-fuel aircraft.

BBC: Solar Impulse plane lands in Phoenix

About 15 percent of the new cars sold in California by 2025 must run on electricity, hydrogen fuel or other alternative fuels that produce near zero or no emissions, according to new rules adopted unanimously by state regulators on Friday.

FORBES: California Sets New Rules To Boost Zero-Emission Car Sales

Toyota has always believed that fuel cell technology is the long-term answer for zero emissions driving, so the company pulling back from a tepid market should not be viewed as a surprise.

FORBES: Retreat on EVs Not a Rout