Most cities on Earth will be too hot to host the Summer Olympics by 2085

With temperatures rising rapidly and a blistering summer that scorched all previous records, the future of the Summer Olympic Games could be in jeopardy.
A new study, published in The Lancet medical journal, suggests that in 70 years only eight of the 543 currently viable major cities will be able to host the Summer Olympic Games.
The research team analyzed weather factors, including heat radiation, temperature, wind data, and humidity, to determine the cities that would still be safe for athletes by 2085.
Researchers focused on cities with populations of at least 600,000 (necessary to be considered as a host) and omitted cities with elevations over a mile above sea level (altitude has implications of its own).
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