It turns out a staggering number of Chinese people are willing to pay more for renewable energy. But businesses that sell green power to consumers, prolific elsewhere, haven’t yet got a single foothold in the biggest market on earth. A survey of 3,000 Chinese city-dwellers by Ipsos Mori, a polling company, found that a massive 97.6% of them would like to buy clean power. Of those, over 90% would be willing to pay extra for…