By 2050 most of the world will be too hot to hold the Olympic Games

In a few decades, much of North America will have maximum wet-bulb globe temperatures (WBGT) exceeding 89.6°F (32°C) – for when even short periods of outdoor work risk heat-related illness or death.

Projected annual max WBGT in global cities, average 2040-2059

Note: Wet-bulb globe temperature is a measurement that combines heat, humidity, windspeed, sun angle and cloud cover. It is a more a nuanced metric for setting exertional heat stress thresholds.

Source: CarbonPlan

Graphic: Lou Robinson, CNN