WWF energy report states that by 2050 all energy could be produced by renewable energy sources:

“By 2050, we could get all the energy we need from renewable sources. This report shows that such a transition is not only possible but also cost-effective, providing energy that is affordable for all and
producing it in ways that can be sustained by the global economy and the planet. The transition will present significant challenges, but I hope this report will inspire governments and business to come
to grips with those challenges and, at the same time, to move boldly to bring the renewable economy into reality. There is nothing more important to our ability to create a sustainable future.”
James P. Leape
Director General
WWF International

Source: (http://www.energy.eu/publications/WWF-energy-report-100-percent-renewable-energy-by-2050.pdf)

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