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Originally posted by Derek Trance
The data that shows global temps are currently on an upward trend.
The argument that human activity contributes to both phenomena is impossible to refute.
Why is that? how long have we been recording?
I'm not for or against, but we don't have the data to make a call we only speculate what was going on.
It would be like saying at 6am, it's cold and then at 8am, it's warmer and getting hotter! But we only started recording at 6am,
not yesterday or the day before...which we all know actually happens every day.
Just trying to make you think
The period from 750 BC - 900 AD saw warming up to 150 BC. Temperatures, however, did not get as warm as the Climatic Optimum. During the time of Roman Empire (150 BC - 300 AD) a cooling began that lasted until about 900 AD. At its height, the cooling caused the Nile River (829 AD) and the Black Sea (800-801 AD) to freeze.
The period 900 - 1200 AD has been called the Little Climatic Optimum. It represents the warmest climate since the Climatic Optimum. During this period, the Vikings established settlements on Greenland and Iceland. The snow line in the Rocky Mountains was about 370 meters above current levels. A period of cool and more extreme weather followed the Little Climatic Optimum. A great drought in the American southwest occurred between 1276 and 1299. There are records of floods, great droughts and extreme seasonal climate fluctuations up to the 1400s.