For, what ever it is worth! I contend that all things are cyclic! For reasons as yet unexplained, the Earth seems to warm and or cool! Does mankinds speed it in either direction? It depends upon whose science speaks. A lot of experts contend that mankinds contrbution to "global warming" is negligible, as compared to natural events, such as volcanic activity, both above the sea levels,and below the oceans. Also, interstellar dust might contribute, as may our variable? star (the Sun)!
The real truth is that no-body, really knows! It is just speculation, based upon speculation, and differs from speciality to specialty in the sciences!
Ron ("The Man in the High Castle!")_
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