At high enough humidity, shade won't save you - evaporative cooling (your body sweating) does not work. There is a temperature/humidity line across which a per

At high enough humidity, shade won't save you - evaporative cooling (your body sweating) does not work. There is a temperature/humidity line across which a perfectly healthy person, sitting in shade and drinking unlimited water, will die. That's why this is terrifying. There's no "gee nature is great a tree will save us" about this.