Manmade Global Warming or Dansgaard-Oeschger Event?

At the end of the last ice age Doggerland (land mass between Uk and Europe) sank under the north sea after the temperature rose 7 degrees in 15 years, that wasn't man made.

I'm really not sure. All I know is that the polar ice-caps are melting and that the recent weather was caused by the gulf stream. The weather has been freaky this summer, but as we're also being told that the Mayan calendar ends in 2012, so according to that we only have about four and a half years left before the world's supposed to end.......crikey!

Dansgaard-Oeschger Events are cyclical patterns of warming and cooling whose cause is not fully understood. There are theories which vary from solar cycles, to lunar cycles, to natural rebounding (too warm-too cool-a bit warm- a bit cool ... like shock absorbers), to Arctic meltwater affecting North Atlantic Thermohaline Circulation. There is no evidence that D-O Events are associated with the phenomenon we currently call Global Warming.

Increased heat retention due to green house gasses is increasing Arctic ice melting. The fear in the scientific community is not that D-O Events are the cause of Global Warming but rather that Global Warming melting Arctic ice at an increasing rate could drive that effect faster and further than ever seen before.

There is no use quoting something without providing context. The source of your quote did not provide context, then they were probably selling you a bill of goods.

Man-made global warming/climate change is proven fact. There is no "alternative explanation." The delusions of some crackpots and/or propaganda from oil companies do not constitute an "alternative" to the facts.

The timing is way way .... way off for a Dansgaard-Oeschger event.

They happen every 1500 years or so. They happened about 400BC and 1200 AD. The next one is due in 2700 AD or so.

You may be confused about this because global warming deniers have shamelessly and grossly manipulated data to lie about these cycles. See "Curve manipulation – lesson 2" on this page (you'll need to scroll down to the second item).

http://stopeglobalwarming.info/blog/index.php

Climatologists know all about these cycles. And 99+% of them still say that man made greenhouse gases are the major cause. That explanation matches the data. The idea that this is a natural cycle does not.

"I wasn’t convinced by a person or any interest group—it was the data that got me. I was utterly convinced of this connection between the burning of fossil fuels and climate change. And I was convinced that if we didn’t do something about this, we would be in deep trouble.”

Vice Admiral Richard H. Truly, USN (Ret.)

Former NASA Administrator, Shuttle Astronaut and the first Commander of the Naval Space Command

You've restated with some abstruse language a preposterous notion that has been posted hundreds of times here. No, it's unlikely all the climatologists and meteorologists of the world have collectively mistaken Global Warming (described and understood for at least 100 years) with the ice age cycles (described and understood for at least 100 years). It takes folks like you to do that.

I don't rule out the possibility of other factors contributing to climate change. However, because the basis of the current global warming theory is so solid and built on scientific fact, I am confident that the current warming trend is mainly due to increased greenhouse gas concentration due to human activity.

We know hundreds of gases emitted by human activity act as greenhouse gases. So, even if other factors are involved, human activity must effect the climate as well.

Bob said:

"The timing is way way .... way off for a Dansgaard-Oeschger event.

They happen every 1500 years or so. They happened about 400BC and 1200 AD. The next one is due in 2700 AD or so."

Please cite scientific evidence that we had verifiable D-O events at 400BCE and 1200CE.

I find it quite humorous that one week we have folks saying in effect, if it's not Milankovitch, then it must be man. Now we have them saying, if it's not Milankovitch or D-O, then it must be man.

Spin control on max.

well, it is a thought but it still all seems a bit too suspicious to be a natural phenomenon to me. I think it is man-made; look at the amount of energy the world used each year then you begin to see how the climate can and inevitably will change.

the D-O event sounds like something I'd prefer to believe, I don't think we can do that much damage, unless we throw a few nukes around......