As world leaders converge on Davos, most of the chatter is about coping with Trump, who is bringing half his cabinet. A quieter China will be there to pick up the pieces. In that respect, today is zero sum. A loss to America is a gain for China. Countries in America’s hemisphere, including Canada, are moving closer to Beijing. Mark Carney, Canada’s prime minister, is stopping in China before heading to Davos. As goes Carney’s itinerary, so goes global diplomacy.