去年9月，联合国政府间气候变化专门委员会（Intergovernmental Panel for Climate Change）警告说，如果世界再不转变增长模式，全球气温将升高4—6℃，远远超出被认为是“安全”的2℃升温水平。
Last September, the Intergovernmental Panel for Climate Change warned that if the world sticks with “business as usual,” global temperatures may rise more than 4°C – far beyond the 2°C increase that has been deemed “safe.”