Even with political forces and billions of taxpayer dollars aligned behind renewable energy, the energy mix two decades from now will look similar as wind and solar power face daunting challenges, according to a report by IHS CERA and the World Economic Forum.

In short, the future is natural gas and oil, according to the study, Energy Vision 2013.

Rex Tillerson, chairman and CEO of ExxonMobil Corporation, USA, said that in the decades ahead the scale, affordability and versatility of oil and natural gas will continue to provide the majority ...