Historical Temperatures

& some views from history

Earth's history blows hot and cold

It’s kind of hard to get into a panic about a couple tenths of a degree after looking at this:

For >75% of its existence, Earth has been substantially warmer than it is now — warmer as in, too warm for polar ice caps. Only for less than 1 billion of the last 4.5 billion years (and not all in one go, mind you) has Earth been as cold as it is now, at least according to the rocks.
Geologically speaking, Forest in Antarctica & Greenland IS “normal”.

Here’s the last 140,000 years from the Vostock ice record.

Confusingly today & Holocene on left & Eemian interglacial on right.

From the Central Greenland Ice Core record- https://www.pressdispensary.co.uk/q991593/images/20k.jpg

After the Younger Dryas mini ice age, the climate went into a climate warmer than today.

The Last Glacial Maximum (LGM) ended about 22,000 years ago, and between then and the Younger Dryas Boundary event (YDB) at 12,800 years ago, there were two warm periods separated by a very short cold period. The cold period was the FIRST Younger Dryas, [the Older Younger Dryas !! ]. It separated the Bolling warm period from the Allerod warm period, which is the one that the Younger Dryas ended so abruptly.

BTW, all of those periods were discovered and named by biologists who recognized the changes in flora in Scandinavia. The dryas is a type of arctic flowering plant. https://en.wikipedia.org/wiki/Dryas_%28plant%29

“The past 10,000 years (since the end of the last Ice Age) were 2-5 degrees warmer in Greenland ice cores until about 1,500 years ago when we entered a period of markedly cooler climate, including the Little Ice Age (LIA). During the LIA, alpine glaciers around the world reached their maximum Holocene extents, generally dating back to about 1500 AD. There followed several periods of cooling and warming when repeatedly glaciers expanded and retreated. Glaciers during the cool period of 1880 to 1915 reached almost to their LIA maxima, retreated during the 1915 to 1945 warm period, expanded again during the 1945-1977 cool period, and retreated during the 1978 to 2000 warm period. The point here is that global climate warms and cools repeatedly and we are still thawing out from the LIA.”

[ Dr Don Easterbrook Professor Emeritus of Geology at Western Washington University ]

If the ice core records from Greenland are correct.
  1. Our Holocene interglacial is about 11,000 years old and it is probably drawing to its close in this century, the next century, or this millennium.
  2. The early Holocene had pretty flat temperatures for the first 8000 years a drop of only 0.05 degC /millennium
  3. The recent Holocene (for the last 3000 years since 1000BC) has seen a temperature drop at 10 times that rate 0.5 degC / millennium
  4. The last millennium was the coldest of our current benign Holocene interglacial

Concern about Anthropogenic Global Warming is a total fallacy and there is absolutely nothing that Mankind can do about it. Whatever is done will never impede the impending cold.

Earth’s Complex Climate

Some good quotes from this well reasoned NASA article- Oct 2000**,


“Is human activity warming the Earth or do recent signs of climate change signal natural variations? In this feature article, scientists discuss the vexing ambiguities of our planet’s complex and unwieldy climate.”
“The Earth has gone through and continues to go through cycles of warming and cooling. It’s just natural. This natural variability often shows an astounding degree of complexity, much of which remains poorly understood.”
“If there’s one lesson to be learned from science, it’s that things are usually much more complex than they at first appear.”

** (just before NASA became politicized in 2002 http://articles.orlandosentinel.com/2006-02-12/news/NASAPOLITICS12_1_nasa-okeefe-cape-canaveral & http://www.dailytech.com/NASA+James+Hansen+and+the+Politicization+of+Science/article9061.htm).

A set of historical temperature graphs from a large selection (243) of mostly non-urban weather stations in both hemispheres. – http://www.john-daly.com/stations/stations.htm only goes to 2003 so none of this data has been touched by the recent ‘data adjustments / homogenizing’ record tampering.