Climate change warning: Greenland once melted and raised the ocean 5 feet.

With its quotations from the prophets Isaiah and Amos, the philosophers Aristotle and Charles Taylor, and the Nobel Laureate Holocaust survivor Elie Wiesel, Prime Minister Mark Carney’s landmark speech on antisemitism aimed for some of the most rousing oratory of his premiership, as he urged all Canadians to engage with this challenge that should not be for Jews alone. But the strongest reaction in the audience at Toronto’s Holy Blossom Temple, the oldest synagogue in Canada, was to what the prime minister left unsaid. “He did not use the word ‘Zionism’ once and he could have,” said...