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ASHRAE, the American Society of Heating and Refrigeration Engineers, has determined the best conditions for indoor comfort, which is roughly 77 degrees fahrenheit at 15% relative humidity. It seems that a higher temperature, say 95 F, would never be comfortable at any RH, which is probably true in an indoor situation.
It's obvious that humans can live and prosper in a variety of climates ranging from the chilly Arctic to torrid Saudi Arabia. Inupiats that move from the shore of the Chukchi Sea live comfortable, happy lives in suburban Miami. Every white man that works at Prudhoe Bay year around came there from a much warmer climate, maybe Oklahoma or Texas. Many immigrants from sub-tropical Viet Nam and Laos and Somalia, a little more than 5 degrees north of the equator seem to do OK in places like wintry Wisconsin.
Climate changes over time, of course. In fact, no one knows for sure if conditions will be warmer or cooler in the future, which is when climate change will be apparent. If it does get a little warmer over a couple of centuries will anyone really notice the fact? The life span of one human isn't long enough to measure climate change. Sure, everyone remembers cold winters of the past and hot, dry summers, too. That's no indication of climate change. It's also likely that any climate change that does occur won't be distributed equally over the globe.
So, don't worry over climate change. You'll never know how much or which way. And it won't matter anyhow. There are bigger problems in store.
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