Commentary “Well, life is always full of tough choices in the relationship between nations,” said John Kerry, responding to Bloomberg’s David Weston on Sept. 22. Weston had asked him, “What is the process by which one trades off climate against human rights?” What is wrong with Kerry’s response? For one thing, such a trade-off violates the Genocide Convention of 1948, which requires signatories, such as the United States, to undertake “to prevent and to punish” acts of genocide. China is committing “genocide,” as defined in Article II of the Convention, against Uyghurs, Kazakhs, and other Turkic minorities. Second, Kerry, the U.S. special presidential envoy for climate, was going back on his word. In January, he said that climate was a “critical standalone issue” and promised that other matters “will never be traded for anything that has to do with climate.” Third, Kerry should know by now that, as a practical matter, no trade-off is possible …