While the earth has gone through climate shifts numerous times in the past, I am given to understand that these were abrupt on a cosmic scale, but still take hundreds of thousands of years.
The current climate shift is really drastic by comparison. In looking for a cause for such a dramatic shift, it is easy to see that the largest differance would be the introduction of industrialized nations.
It is foolish for people to believe that humans have not had an effect on the environment, globally as well as locally.
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