The International Energy Agency says that the world's capacity to generate electricity from renewable sources has now overtaken coal.

In a new report due to half a million solar panels being installed every day last year around the world, renewables accounted for more than half of the increase in power capacity. According to the report there were two wind turbines set up every hour in China.

Renewable energy sources, such as wind, solar and hydro are seen as key elements in the international efforts to combat climate change. At this stage, the report has identified that it is the capacity to generate power that has overtaken coal, rather than the amount of energy actually produced.