Alok Jha, green technology correspondent guardian.co.uk, Lighting the way ... a solar panel in China's Olympic village. Photograph: Dan Chung China is the world's leading producer of energy from renewable sources and is on the way to overtaking developed countries in creating clean technologies, according to a report by the Climate Group. Published today, the group's report, China's Clean Revolution, shows that supportive government policies investing billions of dollars in energy efficiency and renewables are driving huge levels of innovation in China. The Climate Group says that, despite its coal-dependent economy, China has become a world leader in the manufacture of solar photovoltaic technology - its six biggest solar companies have a combined value of over $15bn (