There is no such thing! The Earth is a living planet and as such there will always be cyclical changes in temperatures. Now, is this cycle 10 years, 100 years, 10,000 years or longer? It is a big planet, so I suspect the cycle will be LONG.
What happens when the Earth warms up?
Well it is a proven theory that the warmer a body, the more energy it will radiate. So, as the Earth warms, (over some long term cycle) it will also begin to radiate more energy. This will catch up with its rate of warming at some stage, and cause a net cooling effect to begin.
The question only remains, what is the cyclical term in thousands of years?
We are fooling ourselves saying that this year is warmer than last year. We need to look at the BIG picture.
So There!
JG
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