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Is CO2 growth and green growth self-canceling?
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Author:  Dingo [ Mon Apr 20, 2015 11:26 pm ]
Post subject:  Is CO2 growth and green growth self-canceling?

This study suggests no. There is the matter of nutrients. Right now I'm leaving out a lot of other negatives such as drought and loss of summer glacial melt.

http://www.sciencedaily.com/releases/20 ... 182747.htm

Quote:
"Humanity so far has greatly benefited from plants removing carbon dioxide from the atmosphere," said Will Wieder, a National Center for Atmospheric Research scientist affiliated with CU. "But if a lack of nutrients limits their ability to keep soaking up CO2, then climate change becomes an even bigger problem than we thought -- unless society can cut back on emissions."

Cleveland and co-authors looked at 11 leading climate models to examine changes in nitrogen and phosphorus. They found that nitrogen limitation actually will reduce plant uptake of CO2 by 19 percent, while a combined nitrogen and phosphorus limitation will reduce plant uptake by 25 percent.

Most of the world's leading climate models assume that plants will respond to increased atmospheric levels of CO2 by growing more and more, which is known as the CO2 fertilization effect. The more the plants grow, the more CO2 they absorb from the atmosphere, thereby slowing climate change.

"But CO2 is far from the only determinant of plant growth," Cleveland said. "Soil nutrients -- especially nitrogen and phosphorus -- also are critical. Because the supply of such nutrients is limited, scientists have warned that plant growth will be less than indicated in climate models."

Author:  herlbert [ Wed Apr 22, 2015 3:38 am ]
Post subject:  Re: Is CO2 growth and green growth self-canceling?

Then, we need to restore soil nutrient if nitrogen and phosphorus are critical.

Author:  Johhny Electriglide [ Wed Apr 22, 2015 4:29 pm ]
Post subject:  Re: Is CO2 growth and green growth self-canceling?

It is easy to see on the CO2 charts, the seasonal fluctuation of ~3 ppm, is what the Earth's plant life can absorb. In a healthy biosphere there are plants that increase with more CO2 while others are less affected. At a normal max of 280ppm, nature has been unable to absorb the massive influx from fossil fuel burning especially after 1950. 120ppm up over the last 200 years.
We are many trillions of trees short of that needed.
In studying ecology it was a general rule that CO2 and O2 stayed in a balance. The thing missing was catastrophism. That comes from study of geology. In this case, green growth can not keep up with CO2 gain.
Human fossil fuel burning and gross overpopulation is a catastrophe for the biosphere. In progress! :-$ :mrgreen:

Author:  Farmer [ Wed Apr 22, 2015 8:39 pm ]
Post subject:  Re: Is CO2 growth and green growth self-canceling?

Short answer....no.
Nature works in cycles , modern human societies break those cycles by moving artificial nutrients in and production out of any given location, then instead of returning the nutrients in their waste to the land ,it is mostly flushed into the ocean.
Until we reorganize food production systems into cycles that fit natural patterns, we are on a downward spiral of biomass production as energy sources shrink.

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