4000 Year Cooling Trend

Ancient Petroglyph Provides Rare Glimpse Into Past Global Warming. The Null Hypothesis of Global Warming Has Never Been Rejected: that all global warming is due to natural variation.

It was hotter 4000 years ago…

Studying air trapped inside Greenland ice cores researchers updated and corroborated their previous findings. The Earth has actually been cooling for thousands of years. Temperature changes during the 20th Century were just a tiny blip among many such blips over the years. The last 4000 years includes ups and downs — cooling trends followed by warming trends, etc. — and even a Little Ice Age lasting hundreds of years from before the time of Charles Dickens to when George Washington crossed the Delaware. But, that is what climate change is all about: it changes!
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