A severe winter storm has killed at least 21 people across the central and southern United States. Record-low temperatures have left more than three million people without power for a second night, most of them in the state of Texas. Al Jazeera's Alexandra Byers reports. - Subscribe to our channel: aje.io/AJSubscribe - Follow us on Twitter: twitter.com/AJEnglish - Find us on Facebook: www.facebook.com/aljazeera - Check our website: www.aljazeera.com/ #AlJazeeraEnglish #TexasFreeze #TexasPowerOutage #ClimateChange