People cool off at a fountain in the Trocadero Gardens during a heat wave in Paris, France, on June 26, 2019. A high-pressure system bringing hot air up from the Sahara is making temperatures climb to unusually level in France where hotspots of up to 40 degrees Celsius are forecast to hit Paris and most French cities this week, forcing the government to raise vigilance and trigger heatwave alert system. (Xinhua/Zheng Huansong)