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Were the people who were concerned about leaded gasoline just a bunch of alarmist also?
originally posted by: RumpleStiltskin
a reply to: jrod
Question, the carbon cycle as a whole, on a yearly basis, how much of the CO2 emitted is man made, how much is natures work?
originally posted by: jrod
a reply to: Nathan-D
Sources minus sinks mate...
Nature had a good balance of the sources vs sinks of CO2...the levels where steady.
Now an extra source of CO2 has been added...and now we are observing a spike in CO2 that directly correlates to our fossil fuel addiction.
Not rocket science bro!
originally posted by: jrod
a reply to: Nathan-D
But once again i really do not think a rational person can try to tell is the CO2 spike is from natural causes.!
Furthermore, we can trace the absorption of CO2 into the ocean by measuring the 13C/12C ratio of surface ocean waters. While the data are not as complete as the tree ring data (we have only been making these measurements for a few decades) we observe what is expected: the surface ocean 13C/12C is decreasing. Measurements of 13C/12C on corals and sponges — whose carbonate shells reflect the ocean chemistry just as tree rings record the atmospheric chemistry — show that this decline began about the same time as in the atmosphere; that is, when human CO2 production began to accelerate in earnest.***
Yeah, warming waters should release more CO2 but oceanic CO2 levels are increasing. How does that work?
That 13C/12C ratio is a pretty good indication that old carbon is the problem.