This year’s El Niño, which is expected to be record-breaking, is already strong and having big effects, nudging up global temperatures and causing dry spells and crop failures on multiple continents. (Unsplash)) By RAYMOND ZHONG and CHICO HARLAN El Niño is the planet’s naturally recurring chaos agent, scrambling weather patterns, spiking global temperatures and typically reaching full strength by December. But this year’s El Niño, which is expected to be record-breaking, is already strong and…