quote:
quote: A few inconvenient questions that man-made climate change advocates can't answer. Back in the old Medieval days wine grapes grew very well in England. Since it's too cold to grow them today, the logical conclusion is that it was warmer then. 1) What were the Romans, Gaules, Angles, Norse, etc doing to pump all that CO2 into the atmosphere? Then it suddenly got colder, a lot colder! So cold in fact that smart scientist often refer to this period as the Little Ice Age. 2) What did humans do to cause this?! Did we stop exhaling CO2? 3) Why do these scientists never just propose what ever we did then, we do now? 1) They weren't, it was the sun. 2) They didn't, it was the sun. 3) It's not the sun this time. I dunno these seemed pretty convenient.

Thanks for the link. I reprinted it since my questions were a little different but essentially the same.

Now I first must start with an apology!
When I skimmed your answer last time all I noticed was it was the sun or nature was responsible for all the thousands and thousands of global climate changes in the past.
Frankly I thought you had converted! I was happy and thought any further communication with you would be so much piling on! You did not! I missed answer 3 I apologies!

Your answer to 3 indicates that the climate shift of 1820AD was not caused by the sun this time!

So please tell me what did cause the shift 200 years ago?
I did not understand the I don't know but this is convenient sentence.

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Posted by Iosh

Bureau of Interstellar Immigration

Member since Dec 2012

18941 posts

Posted on 3/13/17 at 5:27 pm to Gaspergou202

quote:
Your answer to 3 indicates that the climate shift of 1820AD was not caused by the sun this time!

So please tell me what did cause the shift 200 years ago?
I did not understand the I don't know but this is convenient sentence.

I don't know what you're referring to by the shift of 1820 AD. The only dataset that goes that far back is BEST and it doesn't show anything dramatic in 1820, just a recovery from the 1816 Tambora eruption. Large volcanoes cause negative spikes in GMST that recover in a short time due to dimming, you can see Pinatubo in 1991 and Agung in 1963.

Taking your question to refer more broadly to "the climate trend underway during 1820 AD" I would say that's mostly the sun as well. There are a few advocates of an "early anthropocene" that claim that land-use changes for agriculture were already driving things by this time but as far as I know that's a minority viewpoint.

The consensus view is that human influence didn't start to dominate until the mid-20th century. Obviously you won't see a discrete point for when that happens because the growth of emissions and reduction in solar irradiance were gradual trends.

This post was edited on 3/13/17 at 5:34 pm

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