The point is that none of these previous events involved such rapid change as we're seeing now, but even if they did, so what? We know what's going on, it isn't hard to monitor. We've known how the greenhouse effect works for more than 2 centuries, we can measure the amount of carbon dioxide in the atmosphere, we know it's gone up just over 40% since the industrial revolution, we have a reasonable model of the likely results - not perfect of course for such a complex system, but we're seeing the sorts of results that have been predicted. Ice melting over the arctic, glaciers retreating, sea levels rising, more extreme weather and now a disruption to the jet stream. If this was, for example, the detection of a new astronomical object or fundamental particle there wouldn't be any question about whether it existed.
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