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Let's say the Earth is warming up, and therefore climate will be less predictable and more violent.
How much of that is human-induced, and how much is caused by solar output, or the continuing emergence from the last ice age? Polar ice caps, ice sheets on land, and glaciers on Earth are the exception in gelogic time, not the rule. Texas spent much of prehistory as seafloor.
And let's acknowledge that there will be some cost to us because of climate change. How does that compare to the cost we would incur to halt or reverse that change?
Scientists are ASSUMING that rapid climate change can only be caused by human activity. But what evidence do they have of past climate fluctuations over short intervals in time? How do they know how uniform it was? There is evidence that the recession of the great glacial sheets of the last ice age took place over just a few centuries! Unless prehistoric man was hunting mastodon in very, very late-model Ford Explorers, I'm guessing U.S. environmental policy cannot be blamed for that.
We already have seen significant warming over the past two centuries. Where is the cataclysmic effect on human populations? What is this hypothetical breaking point going to be?
