What China's solar panel obsession means for the world

China's latest trade data show another huge surplus, putting the country on course for what could be a record $1.5 trillion trade surplus this year. In the first of two episodes examining China's export machine, we look at the country's massive solar panel industry. We hear from the so-called Sun King, Dr Jerry Shi, China's first solar billionaire, about the rise of solar power in China. Ed Butler also examines how solar power and other green technologies have helped drive the global response to climate change, while critics raise concerns about oversupply and its impact on industries and economies around the world.