Copenhagen has come up with a brand-new answer: ski down the mountain. Well, not exactly. The waste is actually inside Copenhill, a waste-treatment plant 10 minutes from downtown Copenhagen.

There will be extra security around the main synagogue in downtown Copenhagen, the Jewish community said in a statement.

Copenhagen has now become a clean place to live. For instance, the city has gone to great efforts to clean entire harbours to the extent that you can actually swim in downtown Copenhagen. What’s more, ...