These days, just about everyone accepts that the world's truly big economic story is the phenomenal rise of China. That said, they may be surprised to learn that the richest man in mainland China - worth a cool $3 billion and still counting - is not Chinese, he's Australian. Well, Australian-Chinese! Dateline's Chris Hammer travelled to the People's Republic to meet a tycoon whose solar-powered vision for that vast nation is based on years of research he did here in Australia. Indeed, the Sun King is convinced his business plan could actually change the world.