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In my lifetime, the population of the Planet has doubled, with twice as many people doing twice as many things simultaneously. All expending energy. The point is that the Planet is not the same as in the 17th, 18th, and 19th centuries. Our activities have increased exponentially, not linearly. Also, you have distorted my answer. I specifically gave a conservative number of 2.5 degrees in a hundred years, not relating to Greenhouse Effect and allowing considerable room for error. I am attempting to approach the warming with simple logic and to minimize the math to matters of common sense and observable phenomena.
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That is not the way to do this.
The temperature of the globe is not a stagnant thing. Climate change is continuous thing. Changes in the landscape due to climate change are ongoing. The Sahara Desert was not always a desert. It was previously a Great Plains type of environment. It changed prior to the rise of the Old Kingdom in Egypt.
It is believed by some that the migration of the desert people to the Nile Valley and the synergy created by the collision and combination of ideas created one of the first great empires of the world.
The point is, though, that climate change is not new and is ongoing and has been present on the world for billions of years. The frantic and panicked approach of the AGW Alarmists is that "we have to act now to stop it".
The little bit they leave out is that climate change has always been happening, the change to date over the last 2000 years is only 0.7 degrees and that we are presently cooler than the warmest part of this interglacial or any of the interglacial warming peaks in the last half million years.
It is only by wearing blinders and ignoring actual historical data or changing it that the panic is justified.
You indicated in your post that the various factors all had a particular forcing and I was only adding up those forcings and asking when the 20 year cycle you described actually started.
From you post:
"At one time I calculated petro usage to add one tenth of a degree every ten years.
So, coal probably adds a tenth.
Natura Gas adds a tenth.
Biomass adds a tenth.
Nuke adds a tenth.
That's five tenths every ten years. "