Global Warming Natural Cycle - Human Induced

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The idea that Global Warming is a natural cycle is well understood from paleo data covering the past 1 million years. Is there a difference between current climate, and the natural cycle? For the past million years the natural climate has oscillated between warm periods and ice ages. This shifting in and out of warm periods and ice ages is correlated strongly with Milankovitch cycles. In order to understand the difference between natural cycle and human-caused global warming, one needs to consider changes in radiative forcing and how this affects systems on earth such as the atmosphere, vegetation, ice and snow, ocean cycles and related effects. The current radiative forcing levels are clearly outside of the natural cycle range.

Is global warming a natural cycle? Or is global warming affected by human influence? What does the science say? Both are true. In the natural cycle, the world can warm, and cool, without any human interference. For the past million years this has occurred over and over again at approximately 100,000 year intervals. About 80-90,000 years of ice age with about 10-20,000 years of warm period, give or take some thousands of years.

The difference is that in the natural cycle CO₂ lags behind the warming because it is mainly due to the Milankovitch cycles. Now CO₂ is leading the warming. Current warming is clearly not natural cycle.

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