Why European countries facing heat waves? Know reason

European countries are facing the heat waves these days, as wildfires raged the southwestern France and Spain. As a result, thousands of people have to be evacuated from their homes as blistering summer temperatures put authorities on alert in parts of Europe. About 14,000 people had been evacuated from France's Gironde region by Saturday afternoon. Know the reason behind these heat waves in Europe in the Aajtak's new show "Black and White" with Sudhir Chaudhary.