A grassland fire in Mongolia has raised fresh concerns in China, underscoring the recurring risk of cross-border environmental hazards. This is not the first time an environmental disaster originating in Mongolia has threatened to cross the 4,700km (2,920-mile) border into China, with the impacts sometimes also affecting the Korean peninsula and Japan. The blaze, which erupted on October 8 in the inland country’s easternmost Dornod province bordering Russia and China, advanced rapidly towards...