Cycles within cycles: plan for a 400 frame animation representing Earth’s complex motion around the sun, with each frame representing 500 years.
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Human impact is upsetting a natural pattern observed to occur during the most recent glacial-interglacial period.
The natural cycles of Earth’s motion interact, affecting climate change. The net result of their different rates and extents create patterns of motion. At different times in the cycles, the Earth is closer or further away from the sun, making Earth warmer or colder.
Since the Cretaceous period, called the Greenhouse World, 850,000 years ago, levels of C02 in the atmosphere have never been as high as they are now. Scientists know this from examining the air bubbles trapped in ice cores (Dominic Hodgson, in con, Cambridge 2008).