The U.S. National Academy of Sciences joined 12 other national science academies on May 16 in issuing a statement calling on world leaders—particularly G8 leaders who will meet in June—to address global climate change and energy-access issues by promoting low carbon-emission energy systems and more efficient use of energy. This Joint science academies’ statement on growth and responsibility: sustainability, energy efficiency and climate protection, says: “Our present energy course is not sustainable…The problem is not yet insoluble, but becomes more difficult with each passing day.”