How Feasible is 100% Renewable Energy?

Source: cleantechnica.com

Scotland by 2020, Australia by 2030, Denmark by 2050 – these countries are all aiming to produce 100% of their energy from entirely renewable sources.  Smaller countries such as Iceland and Lesotho are practically doing so already.  This year saw the first international conference focused on 100% renewable energy targets – so can the rest of the world catch up?