A report by the American Wind Energy Association has shown that in 2012 wind farms across the USA reached a capacity of 60GW (60,000MW) generating approximately 140 TWh (140 million MWh) resulting in a lowering of CO2 emissions by 79.9 million metric tonnes.

An equivalent saving to taking over 14 million cars off the road.

By the end of 2013 new projects are expected to increase the total to 98.9 million tonnes of CO2 which can be offset against annual US emissions of around 5.4 billion tonnes of CO2 per year.

Conversely, here in the UK the latest FITs status report from OFGEM shows that installations of all renewable technologies including wind has shrunk to its lowest level since 2011 as subsidies and planning policy put in place by the last government are slowly eroded by the Conservatives.