BBC Global warming video

Discussion
1

Clay,

You wrote:

global warming ...
[is] certainly man-made.

What factors caused the dramatic warming 12,500 years ago? And another warming 11,500 years ago?

What has led you to rule out these factors as the cause of the current warming cycle?

Best, Michael

2

What factors caused the dramatic warming 12,500 years ago? And

another warming 11,500 years ago?

What has led you to rule out these factors as the cause of the

current warming cycle?

1) What warming trends at these times do you know of that are not
correlated with CO2?

http://www.chemistryland.com/CHM107/GlobalWarming/ChartFromBookCO2vsTemp-w.jpg

2) What other factors do you know of (even one would be nice) that
provably and strongly correlate to mean global temperature, as we know
CO2 does?

Answering some of these basic questions would add some coherence to
these questions.

Clay