Business Green: The world’s energy needs could be met entirely from renewable sources by 2090, according to a major new study from Greenpeace and the European Renewable Energy Council (EREC). The 210-page report, entitled “Energy [R]evolution: A Sustainable World Energy Outlook,” argues that improvements in energy efficiency could slash energy requirements in half compared to business-as-usual scenarios, enabling renewable technologies to meet the remaining energy requirements. The study says …