GreenBiz: It will cost $515 billion annually through 2030 to wean the world off fossil fuels in favor of clean energy sources, according to a report released last week by the World Economic Forum. Onshore and offshore wind, solar thermal and photovoltaics, waste-to-energy, geothermal and next-generation and sugar-based biofuels were identified as large-scale clean energy sectors that governments throughout the world should pursue to address energy security and climate change, the report (PDF) …