Do you notice all the trends start at 1850? The reason is that for over 150 years before 1850, we were in a cooling phase, and 1850 was the beginning of a warming phase, that peaked in 1934 (the warmest year on record). There is much evidence that it was much warmer at some several centuries ago (when Greenland was much greener and could support a colony).

Do you notice all the trends start at 1850? The reason is that for over 150 years before 1850, we were in a cooling phase, and 1850 was the beginning of a warming phase, that peaked in 1934 (the warmest year on record). There is much evidence that it was much warmer at some several centuries ago (when Greenland was much greener and could support a colony).