As expected, the UN’s Intergovernmental Panel on Climate Change (IPCC) found “with 90% certainty” (up from the high 60% last time) that global warming over the past 50 years has been caused by man-made factors. This is all fine and good, but you gotta wonder how on earth they explain past warming periods that far pre-date the internal combustion engine? Had the IPCC been around then, what would they have said — that it was caused by the mere threat of such devices?
Our friend Bob Carter reminds us that context is everything. While some scientists can show warming over the past years or decades, the picture changes dramatically when you look at longer time intervals appropriate for a planet that is some 4.5 billion years old. When you do, you see cycles of warming and cooling unrelated to — and pre-dating — the dawn of human civilization and later, industry — by a few hundred thousand years. There was still a carbon dioxide buildup, but there were no environmentalists around to blame us for it.
And so we only ask the question, how does the IPCC explain prior periods of warming, way before the industrial era?
Just wondering, that’s all.
Oh, and here’s a link to an op-ed in yesterday’s WaPo about the topic, ignoring all these people who don’t think there’s consensus and ignoring the fact that for a good spell in the 70’s, folks were squawking about global cooling. But hey — why muddy the story with facts?
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