The sweltering temperatures that have blanketed the world this summer haven’t just been uncomfortable — they’ve been downright deadly.

Last month, a heat wave in Québec took the lives of as many as ninety people. At least fifty-three people died in Montreal alone, the victim of temperatures that shot past 40 degrees Celsius (104 degrees Fahrenheit). The city morgue reported being overwhelmed — the first time this has happened due to heat-related casualties.

The majority of those affected were from vulnerable communities, those who lived alone, and those suffering from chronic or mental illness. The poor, the sick, the elderly. Infants, whose internal temperature regulatory mechanisms remain underdeveloped. A lack of air-conditioning proved lethal.