content: This author thinks the idea of being off fossil fuels by 2100 is absurd.  Can anyone play devil's advocate and rebut his points? http://www.energypost.eu/good-luck-g7-leaders-wont-fossil-fuels-2100/ I want to believe we can completely break our fossil fuel dependency but I feel like this guy makes a lot of valid points.  Anyone knowledgeable about the subject care to make a counter-argument?