Millions around the world have been seeking refuge from the scorching sun as climate change, a strong El Nino and summer in the Northern Hemisphere converge, toppling temperature records. In Phoenix, temperatures have hit 110 degrees Fahrenheit (43 degrees Celsius) for 13 consecutive days. Volunteers are helping residents, typically hardened by the desert's sweltering summers and insulated by air conditioning, that now need relief. The heat in the southwestern U.S.