Humans have already adapted to a wide range of temperatures. The problem is a rate of change of temperature that is so fast that most species cannot adapt to it quickly enough. A supervolcano, large asteroid, or real fast increase in greenhouse gases, may create such a fast change in temperature.
An ideal temperature isn't the issue. It's a high rate of temperature change that will cause a hardship to life on earth.
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Yet more bullshit...the only proxy studies that have sufficient resolution to to make claims about periods as small as 100 years show us that over the past 10,000 years, there have been temperature changes far exceeding anything we have seen in shorter time spans.
You have absolutely no evidence that the amount of, and rate of change we have seen is in any way extraordinary...in short, it is a fiction...a bald faced lie...entirely made up in an effort to support an alarmist narrative.
Here are the proxy studies with sufficient resolution to make claims about temperature changes on century scales and they show precisely the opposite of what you, and other hand waving, hysterical alarmists claim.
First is the GISP2 study derived from ice cores taken in Greenland. True, they are taken from above the Arctic circle, but ice cores are the only proxy capable of providing the resolution required to make claims on a century scale...and climate science has been telling us for decades that the polar regions are the canaries in the coal mine and whatever happens there, will follow globally.
The second gold standard temperature reconstruction is derived from the Vostok ice core in Antarctica. A close look at the temperature change tracks nicely with the GISP2 study indicating that the changes, and rates of change were global...unless of course you can provide a rational, scientifically valid reason that polar temperature reconstructions would show similar temperature increases and decreases on similar time scales but the globe between the two ice cores was somehow left out of whatever change happened in the polar regions.
And an ideal temperature is precisely the issue. It is the claim of climate science that an ice age provides the ideal temperature for life on planet earth and the fact that the earth is warming out of an ice age is cause for alarm and heralds impending catastrophe when the fact is that we haven't even warmed to the mean temperature from the time of the onset of the little ice age. It is pure alarmist hysterical handwaving without basis in fact.
