Civilizations flourish during warm periods

Civilizations decline – and sometimes fall – during colder periods.
These graphs say it all.


Civilizations flourish during warm periods

From:
http://muller.lbl.gov/pages/IceAgeBook/Image2.gif


Colder periods trending even colder


Colder periods trending even colder

From:
http://muller.lbl.gov/pages/IceAgeBook/Image3.gif

Thanks to F. Guimaraes  for these links

 


6 thoughts on “Civilizations flourish during warm periods”

  1. Al Gore in his book An Inconvenient Truth indirectly refers to modern civiilization of the last 10,000 years. Unfortunately, or conveniently, Gore fails to give credit to the present Interglacial Warmup Period as the father of modern societies and source of all the bounty of the last ten millenia. Enjoy it while you can; this IWP is long in the tooth and will end soon if history is any teacher, and we shall descend into the next inevitable ice age.

  2. I still wonder why he called his book that. But inconvient lie wouldn’t sound as good. What your still missing is the corelation of lack of rain in the growing season, to add to the cooling periods. The lack of growing season, the shortening of the growing season, with the local crops, determine the amount of souls that can be sustained per acre. The opening of croplands, change the amount of water resperated to the atmosphere, you could check on the reports out of amozonia for those.

  3. During the last Ice Age, the SW United States was a beautiful green and wet wilderness, with lakes and rivers where there are now only dry lakebeds and sandy washes. The Sahara Desert was a nomadic hunter’s dreamland, with vast grasslands, rivers and lakes. This can be seen in ancient rock art there and in Shuttle radar images that show only buried dry riverbeds. The same applies to the Arabian Peninsula, where rock carvings attest to the wild game and water and reveal the ancient migration routes of humans out of Africa. Apparently, the northern and southern jetstreams converge toward the equator during ice ages, bringing lifegiving rains where there are now only deserts.

    • Well, here in southeast Texas, a green, wet wilderness, with lakes and rivers sounds nice to me. Sure do wish the northern and southern jet-streams would converge again. Yes, we could use some life-giving rains and even a little cool weather, which by the way, used to be considered normal here.

  4. Thank you Robert! These graphs also caught my attention since the first time I saw them, some 4 years ago, when I started to investigate all the buzz about GW more seriously. The trend is obvious isn’t it?
    IMO it tells that the new Ice Age is knocking on our doors.

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