France is experiencing a severe heatwave, with Monday marking its hottest June day on record, according to the national weather service. At least 40 people have died as a result of the extreme temperatures, authorities report. The heatwave is impacting a large portion of the country, prompting health warnings and emergency measures. The fatalities are largely among the elderly and those with pre-existing health conditions. Authorities are urging citizens to stay hydrated, seek shade, and check on vulnerable neighbors. The extreme weather is raising concerns about the increasing frequency and intensity of heatwaves linked to climate change.