1. Renewable Energy Now Cheaper than New Fossil Fuels in Australia. Bloomberg New Energy Finance (7 Feburary 2013);
http://about.bnef.com/press-releases/renewable-energy-now-cheaper-than-new-fossil-fuels-in-australia
2. Carr, G. Sunny uplands. The Economist (21 November 2012);
http://www.economist.com/news/21566414-alternative-energy-will-no-longer-be-alternative-sunny-uplands
3. Germany’s Tenuous Transition to Renewable Energy (Stratfor, 2013);
http://www.stratfor.com/sample/analysis/germanys-tenuous-transition-renewable-energy
4. Gabriel: Beim Klimaschutz ist das Ziel nicht zu halten (Spiegel Online, 2014);
http://www.spiegel.de/politik/deutschland/gabriel-beim-klimaschutz-ist-das-ziel-nicht-zu-halten-a-1003183.html
5. Hansen, J. E. Storms of My Grandchildren: The Truth About the Coming Climate Catastrophe and our Last Chance to Save Humanity (Bloomsbury, 2009).