"Svante said 5-6C for doubling CO2, including feedbacks:

http://en.wikipedia.org/wiki/Svante_Arrhenius#Greenhouse_effect

Fuller needs to work on his accuracy."

The reference *you* provide says:
"Arrhenius estimated that halving of CO2 would decrease temperatures by 4 - 5 °C (Celsius) and a doubling of CO2 would cause a temperature rise of 5 - 6 °C. In 1906 Arrhenius adjusted the value downwards to 1.6 °C (including water vapour feedback: 2.1 °C). "
http://en.wikipedia.org/wiki/Svante_Arrhenius#Greenhouse_effect

So the Wiki reference says Arrhenius later estimate for doubling of CO2 was 1.6 C. With the addition of .5 C for water vapor feedback.

Whether Wiki is correct or Fuller is correct, I don't know. But since you provide *your* reference as Wiki, you need "to work on your accuracy"- or simply read and understand your own reference.

And in the link *I* provided, Fuller said:
"Svante Arrhenius estimated 5 degrees Celsius a century ago--then redid the numbers and said between 1.6 and 2.1 degrees Celsius for a given doubling of CO2 concentrations."

So there is a difference between Wiki and Fuller. But if we accept Wiki as correct, Fuller should said 1.6 instead between 1.6 and 2.1 C .

"The interesting astronomy connection is that scientists were trying to calculate the Moon's surface temp in the late 1800s by measuring infrared radiation coming from it and had to account for CO2 absorption in the Earth's atmosphere. They realized that measuring IR from the moon near the horizon as opposed to at zenith imitated the effect of increasing CO2 in the atmosphere. This is in the book, The Long Thaw.

Would probably make a good high school science experiment today. "

Yes, it would be interesting considering we have better instruments, and more importantly, we now know something about the surface composition of the Moon, unlike our knowledge in the late 1800s.
But it require a education system that was vaguely competent for this kind thing to routinely occur in high schools.
Though they seem to manage to show AL Gore's film to those in elementary school.