Agence France-Presse: China plans to dramatically increase its use of wind and solar power, aiming to generate up to one fifth of its energy from renewable sources by 2020, a senior official told Britain’s Guardian newspaper. “We are now formulating a plan for development of renewable energy,” Zhang Xiaoqiang, vice-chairman of China’s national development and reform commission, said in an interview in London published Wednesday. “We can be sure we will exceed the 15 percent target. We will at least …