But the United States and other Western countries seem to be near the top of a Kuznets curve for carbon emissions and ready to start the happy downward slope.

• 然而，美国和其他西方国家在碳排放上好象接近了库兹涅茨曲线的顶端，随时都会开始令人欢欣鼓舞的向下倾斜。