Officials in the UK are urging caution, and expanding some emergency services-- as the country braces for extreme heat. Temperatures are expected to reach 40 degrees Celsius in the coming days, and a national emergency has been declared. People are being asked to avoid public transportation, and look out for the elderly and children. Al Jazeera’s Nadim Baba reports from London. Subscribe to our channel: http://aje.io/AJSubscribe Follow us on Twitter: / ajenglish Find us on Facebook: / aljazeera Check our website: https://www.aljazeera.com/ #UKHeatwaves #Heatwaves #GlobalWarming #UK #ClimateChange