Unprecedented and worldwide coordinated measures are needed to transform the global energy system into an almost carbon-free one by 2050. For example, following the discovery of the giant Groningen natural gas field in the Netherlands, the natural gas share went from 1 per cent in 1958 to 5 per cent in 1965 and to 50 per cent in 1971. Portugal increased its share of renewables, including hydro, from 17 to 45 per cent in a matter of five years, from 2005 to 2010, and plans to become the first country to inaugurate a national network of charging stations for electric cars in 2011.