Imagine a world where renewable energy could account for the majority of the world’s energy needs, and that you may live to see that day. 
The good news is that according to the U.N. Intergovernmental Panel on Climate Change it is achievable by 2050. The U.N. panel said that renewable resources like solar, wind, geothermal, and wave could supply up to 80 percent of the world’s energy needs by 2050 and play a significant role in fighting global warming. In order to achieve this level, governments would have to spend more, and introduce policies that integrate renewables into existing power grids and promote their benefits in terms of reducing air pollution and improving pubic health. The report concluded that the use of renewables is on the rise, their prices are declining and that with the right policies in place, will be an important tool in fighting climate change and help developing countries create sustainable economies. Governments attending the conference endorsed the renewable report. The nonbinding scientific policy document is to advise governments as they draw up policies and to help guide the private sector as it considers areas in which to invest. The report does not consider nuclear to be a sustainable renewable energy source.
I think this is a great idea, just very impractical based on the technologies out there today. In the alternatives listed for the starting point, about 90% was firewood. The true alternatives (without nuclear and hydro) were tiny. At no point does anyone discuss the cost differences between the alternatives (which is why they are not growing today) and fossil fuel. Anyone who reads this report should also read the ExxonMobil report on fuel sources for 2030 which includes renewables. I think this new report is wishful thinking until new technologies that we do not know about are developed. I am pro-renewable, but I don’t see the technology that is out there today coming any where close to the difference between the Exxon and the new report and I am in the renewables field.