Greenpeace's Asia tour is promoting clean, renewable energy and highlights the costs of climate change. Its focus in Guangdong and Hong Kong has been on wind energy. But why wind as opposed to solar or other renewable energy? Robin Oakley, climate campaigner for Greenpeace China, says wind power technology is ready to be used now and 'on the big scale we need'. 'One key study in the UK showed that, by 2020, on-shore wind will become the cheapest form of energy available,' he says. According to US studies, the cost of wind energy has dropped to one-fifth what it was in the 1980s as the technology improved. Costs are expected fall a further 30 per cent over the next few years. Some regard massed wind turbines as an eyesore, but Oakley says the environmental benefits outweigh the aesthetics. 'Everyone has an opinion on how any piece of infrastructure looks. Many people argue that wind turbines look graceful,' he says. 'They're certainly prettier than a huge smoking chimney.'