Commentary Boris Johnson is sometimes likened to Donald Trump—a British-style populist, albeit one who can recite chunks of Homer’s “Iliad” in the original Greek. In truth, many of his positions are closer to those of President Joe Biden. Tackling climate change and biodiversity loss would be his government’s “number one international priority,” Johnson wrote in a foreword to the British government’s integrated security, defense, development, and foreign policy review released last week. In a severe case of John Kerrynomics—the belief that decarbonization makes countries richer—the integrated review states that the foundations of Britain’s future prosperity will be built on cutting greenhouse gas emissions. Imposing artificial constraints on economic activity cannot make a country richer; the only question is how to minimize the cost of the constraint. With Britain hosting this year’s U.N. climate conference, we can expect lots of green virtue signaling. Britain has reduced its national emissions by at least 68 percent compared …