BBC: A solar-powered car has arrived at the UN climate change talks in the Polish city of Poznan after a round-the-world trip covering almost 40 countries. At the wheel of the “solar taxi” was Swiss teacher Louis Palmer who made the 52,000km (32,000 mile) 17-month trip. He said the feat proved solar power was a viable alternative to oil-based fuels and could help fight global warming. But he said the prototype would need serious modification before it could be mass …