When the U.N. climate agreement was signed at the Rio Earth Summit in 1992, it made clear that “measures taken to combat climate change, including unilateral ones, should not constitute . . . a disguised restriction on international trade.” (Similar language appears in the Kyoto Protocol.) As Australian political scientist Robyn Eckersley puts it, this was “the pivotal moment that set the shape of the relationship between the climate and trade regimes” because, “Rather than push for the recalibration of the international trade rules to conform with the requirements of climate protection . . .
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