China will soon surpass the U.S. to become the world’s largest economy. And now it is poised to overtake this country by yet another metric: environmental protection. In an unexpected development, China — known for its choking urban pollution and notorious Three Gorges Dam — has introduced new dietary guidelines that seek to cut its meat consumption in half.If this sounds familiar, it might be because you remember similar guidelines proposed in the U.S. in 2015 — which were promptly rejected by officials on the grounds that dietary guidelines aren’t an “appropriate vehicle” for addressing sustainability concerns.