"It’s worrying for future generations," says a father, sitting near a water fountain in Nantes (Loire-Atlantique department, western France). It is just past midday and temperatures are soaring across the city, which is on a yellow heatwave alert, as is the rest of the department. According to Météo France, the temperature could rise to 35 degrees during the day, 15 degrees higher than the seasonal average. IMAGES AND SOUNDBITES