The Swiss solar-powered plane Solar Impulse 2, HB-SIB, prepares to land at Chongqing Jiangbei International Airport in Chongqing, March 31, 2015. [Photo/IC] More photos: First round-world solar flight stops in China Solar Impulse 2 Round-The-World fuel-free flight pilot, Bertrand Piccard, paid a visit and delivered a speech on the importance of a clean energy future at…