Vikings discovered Greenland in the 1500's. They named it Greenland why? Because the tundra was covered in green plant life not ice. In the 1500's there were no CO2 emissions from vehicles or manufacturing and the world's population was much much lower. I very much doubt that great changes in climate are caused by human activity. There is historical evidence that the main influence on our climate is solar activity and the solar minimum and maximum periods.
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