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It came to me suddenly out of the blue that Peter Carter in this video missed a key point.
I went back to see if I was right, and sure enough, I was right.
The point is '
why is warming accelerating during the last 25 years?'
It doesn't seem to be because CO
2 emissions or concentrations in the air are accelerating.
We know it isn't because the sun got hotter, because the Ice Age video shows that the sun has gotten a tiny bit cooler.
We know it isn't because of the Milankovitch Cycles. They are now in the part of the cycle when the earth is cooling and headed for another Ice Age.
It might be because Methane emissions are or have recently increased because of fracking.
Or, it might be because 1 or 2 tipping points have been crossed.
You can see the key data I'm basing my point on in this video on 3 or 4 graphs between the 3 and 8 min. marks. Two of the graphs are of time vs CO
2 emissions or concentrations in the air. As I see these graphs they show that these have increased exponentially until the last 25 years; for those last 25 years they are straight or even show a slight slowing.
OTOH, the graphs for temp. or temp. increase show that temps. are increasing exponentially over this 25 year period. To see this you need to do what Peter did for the years from 1880 to 2017or18. He calculated the slope of the data 4 times for 4 different time periods; they all end in 2018. His 4 lines show an increasing slope over time.
. . . If you do this for just the last 25 years,
I think you can see that, by eyeball estimate, again that the slope increases over time.
But, why is this true? One set of graphs shows that we have done a little to slow the emissions of CO
2 a little. Enough to keep the line for emissions straight and for concentrations slowing a tiny bit. Emissions and concentrations are not currently (over the last 25 years) increasing exponentially. OTOH, the graphs that matter are the actual temp. vs time ones. And they are still increasing exponentially. This is very troubling.
The most likely explanation is that a tipping point has been reached and the earth is emitting something that is increasing the temps. exponentially. This can't be CO
2 because we have direct measurements for its concentration presented here. Methane seems like the most likely cause.
I hope that the cause for this is fracking and not melting permafrost and methane hydrates in the Arctic.
I have seen reports that methane is 150 times worse than CO
2 when it is 1st released and it drops off to 20 times worse averaged over a 100 year period [because after 100 years almost all of it has changed to CO
2 and water]. The thing is that for the 1st 10 years the average is 80 times worse than CO
2 [ton for ton]