100% renewable energy is practical by 2050

According to a new report from Stanford University researchers, we could move to 100% renewable energy by 2050 using only technology that's currently available.   The biggest obsticles are political, including the building of more interstate power lines.  This approach would save the average person $3,400 a year compared to the current mix of energy sources, and doesn't even begin to factor in possible improvements in energy efficiency.  It also doesn't assume the use of nuclear power.  One of the biggest social changes is a move to an auto population that is completely powered by electricity or hydrogen.  This is a clear statement from very well informed sources that such a future is easily possible, given the political will.

Apple chief executive Tim Cook's Leadership on Environmental Responsibility

Under Apple chief executive Tim Cook's leadership Apple has stepped up its commitment to curbing its environmental impact, pledging to supply 100% of its power from renewable sources and crack down on the use of minerals mined in the Democratic Republic of Congo (DRC) that can fund war and human rights abuses
...

“When we work on making our devices accessible by the blind, I don’t consider the bloody ROI (Return On Investment),” Cook said, adding that the same sentiment applied to environmental and health and safety issues.

He told Danhof that if he did not believe in climate change, he should sell his Apple shares. “If you want me to do things only for ROI reasons, you should get out of this stock,” he said.

Cook’s comments and visible passion over the issue are one of the strongest signals yet of his commitment to reducing Apple’s environmental footprint. He told shareholders that he wanted to “leave the world better than we found it”.

http://www.theguardian.com/environment/2014/mar/03/tim-cook-climate-change-sceptics-ditch-apple-shares