Comments by "Arthur Mosel" (@arthurmosel808) on "PBS Terra" channel.

  1. Question, how do these readings compare to records of Europe from around 1000 AD ( my preference rather than the phony CE which uses the same start point but ignores what it is) to somewhere in the early 1800's. Since there are no true records world wide until the second half of the 1900's, we can only use reports of observers where such reports are available. Around 1000AD, the Norse found large areas of the west coast and south of Greenland capable of supporting farming of crops and live stock in areas of Norway. By around 1300AD, the ice and weather had ended farming and the colony was gone (I won't get into a discussionof what became of them). This matches severe weather records in Europe affecting crops and records of glacieral advances in the Alps. In the North American southwest the period saw the end of the Anastasi farming culture, the migration of tribes from the north of the continent, and geological soil samples have indicated a decades long drought in the Great Plains in southwest starting somewhere around 1300 AD. These match reports from earlier periods (admittedly spotty due to losses of earlier written records) and other geological records. This seems to indicate a cycle of about 500 years in heating and warming of the Earth. Can man affect the cycle, probably. Can man control the cycle, probably not. Using a 500 year cycle, we should be reacing its peak, perhaps early because of man. There is evidence of the Gulf Stream being disrupted due to Greenland melt water, which could adversely affect northern North American and Northern Europe, making it harder for agricultural pursuits. At the same time, satellites have shown greening along the margins of the Sahara. What will happen for sure, I don't know. All I do know is that its humankind's ego that thinks that it understands all the factors that go into climate. By the way, I haven't even gone into the connected world wide ocean current whose cycle is around 1000 years. Solar cycles that we are still learning about, or the effects of seismic and volcanic events such as the volcano that blew up near Tonga recently.
    1