A comment from are reader:
"The scam that never dies!
I have a PhD in Atmospheric Fluid Dynamics from McGill University.
I am getting increasingly frustrated by the lack of any actual science that backs up this “problem”.
So please answer the following simple, basic, scientific question:
- What, exactly, is being "measured"?
- And how accurate are those measurements, both now and over time?
- And how do you know what the contribution of human activity is to whatever you are measuring?
I'll make it even easier for you.
Since AGW believers frequently bring up surface temperature, let's look at it.
After all, it's about the simplest thing involved, isn't it?
So show me a map of the earth's surface temperature, and a companion map of the margin of error.
Then do the same thing in (say) 1900.
If you prefer another atmospheric parameter than surface temperature, suggest it and provide reasons for your choice, and then answer the same questions.
- Finally, tell me what part of the differences is due to human activity, how you know, and how accurately you know it.
Bet you can’t."
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