idscience said:
Here is Mr. Hockey stick.
- "Professor Jones also conceded the possibility that the world was warmer in medieval times than now suggesting global warming may not be a man-made phenomenon
Let me clarify something for from the standpoint of one who has some experience in earth's geologic history:
The earth has been warmer and cooler long before man came along. The mechanisms in those cases were largely natural (the MWP, while perhaps localized to Northern Europe may have had a
tiny component related to human activity in relation to land usage), but by and large
we know there are many NATURAL forcings which can drive climate.
THAT DOESN'T MEAN HUMANS CANNOT BE ONE.
In the last 150 years we've been able to
shift the isotopic composition of the atmospheric carbon in just about the exact manner expected from the burning of fossil fuels and vegetal based fuels. We've shifted the carbon to contain more 12-C isotope just as one would expect. Before the atmosphere was contaminated with excess 14-C from atmospheric testing of nuclear bombs in the 60's, we also saw a steady decrease in atmospheric 14-C which is exactly as expected from burning 14-C depleted fossil fuels.
So humanity has been able to change the atmosphere to reflect our burning of fossil fuels, pumping gigatons of a
known greenhouse gas into the atmosphere and we somehow
can't possibly be responsible for a warming?
Here's a logic puzzle:
1. Gunshots to the head often result in death.
2. Bob is dead.
3. Ergo Bob was shot in the head.
Does that seem logically "sound" to you? The ONLY reason Bob could be dead is due to a gunshot to the head?
The same is true for climate. There are a number of possible forcings that are natural and a few that are anthropogenic. Why does something that happened at a different time mean that what is going on currently
can't be due to anthropogenic factors?
Now that it is all out in the open. After being called conspriocists, and anti-science, and global warming deniers, your skewing the data now by saying it did go down but it is really up. Nice.
So you didn't see the upward overall trend?
I'm curious: when you walk up stairs do you stop on each step and say: "because this step is flat I cannot be moving upwards!"
Just curious.
Still no shortage of those still crying "deniers, climate terrorists, climate racists" the sky is still falling we just can't prove it.
Ummm, you'll note that
I don't use those terms.