‘…The global economy can bring global emissions down to the IPCC target of 20 billion tons within 20 years if most countries\u00e2\u20ac\u201d\u00c2\u00adespecially those with either large GDPs or populations\u00e2\u20ac\u201ddevote between 1.5 and 2 percent per year of GDP to investments in energy efficiency and clean, low-emission renewable-energy sources.’<\/p>\n