An electric sportscar finished a remarkable road trip [on November 16] on the Panamerican Highway, traveling from near the Arctic Circle in Alaska to the world's southernmost city without a single blast of carbon dioxide emissions. Developed by engineers from Imperial College London, the SRZero sportscar ran on lithium iron phosphate batteries powering two electric motors with a peak output of 400 horsepower during its 16,000-mile (26,000-kilometer) journey. Powering up was a joy at times, the team said - such as in Chena Hot Springs, Alaska, where they started their trip July 3 after charging the batteries using geothermal energy. The SRZero was literally being charged from energy taken straight out of the earth with absolutely zero CO2 emissions," Alex Schey, a mechanical engineer who organized the trip, wrote in his blog that day. Finding places to plug in along the way became a major challenge as the team passed through 14 countries in 70 days of driving. But every time the driver hit the brakes - and there was plenty of that as the team made its way through the Rocky Mountains, Mexico and Central America and then through South America - the car recovered kinetic energy, extending its capacity to drive as much as six hours and more than 400 kilometers (250 miles) on a single charge. This was no clunky science project - all that horsepower enabled the car to reach 60 mph (96 kph) in just seven seconds and reach top controlled speeds of 124 mph (200 kph), the team said.