Wetlands like CO2 — “Gimme 700ppm” say sedge-grass

scirpus olneyi | Smithsonian

Not only does one particular grass seem quite happy at 700ppm, it was absorbing 30% more carbon dioxide, and there was no sign that it might not be equally happy at even higher levels. Will disaster strike the world at 401ppm? This 19 year study suggests (again) it might not be so bad. Arguably, 700ppm might be better. Even the C4 plants (supposedly the ones which prefer low CO2) still absorbed 13% more CO2 at 700ppm. (Absorbing more carbon usually means growing faster.)

During the worst drought years, growth slowed dramatically, but drought-stricken plants with 700ppm of CO2 around them still absorbed 4% more.

From the Smithsonian

High CO2 Spurs Wetlands to Absorb More Carbon

Under elevated carbon dioxide levels, wetland plants can absorb up to 32 percent more carbon than they do at current levels, according to a 19-year study published in Global Change Biology from the Smithsonian Environmental Research Center in Edgewater, Md. With atmospheric CO2 passing the 400 parts-per-million milestone this year, the findings offer hope that wetlands could help soften the blow of climate change.

Plant physiologist Bert Drake created the Smithsonian’s Global […]

Arid regions of the world are 11% greener, mostly thanks to CO2

Increasing CO2 makes life easier for plants that live in hot dry places.

Thanks to satellites we know the world has “greened up” since 1980, but we were not sure how much of that was due to the fertilizing effect of CO2. To solve that, one group suggests we need to look in warm arid environments where water is the predominant limiting factor. These are the areas which ought to show whether CO2 was really helping plants grow, because when there is more CO2 it enables plants to use water more efficiently for photosynthesis. In places where there is already a lot of water, it won’t make as much difference. So Donohue et al. did that, studying regions with a low level of rainfall. They found that the fertilization effect is real and significant and that the cover in these arid zones increased 11% from 1982 – 2010 and CO2 played a significant role.

(Thanks to pollution, trees are invading grasslands. Whatever will the Greens do to get us back to the Halycon pre-carbon days? Call Gunns?)

CO2 may be the only “pollution” that greens the deserts.

“Using gas exchange theory, we predict that the 14% increase in atmospheric CO2 […]

News from the Non Intergovernmental Panel on Climate Change

A sample of recent scientific news from NIPCC * The Glaciers of Greenland were smaller 5000 years ago; * African savanna trees thrive with increases in CO2; * It was hotter in China a thousand years ago, and by a whole degree; * Marine-life-with-shells can’t agree on their favourite CO2 level and * Temperatures make no difference to the 5000 year record of hurricanes. […]

The debate continues: Dr Glikson v Joanne Nova

Dr Andrew Glikson (an Earth and paleoclimate scientist, at the Australian National University) contacted Quadrant offering to write about the evidence for man-made global warming. Quadrant approached me asking for my response. Dr Glikson replied to my reply, and I replied again to him (copied below). No money exchanged hands, but Dr Glikson is, I presume, writing in an employed capacity, while I write pro bono. Why is it that the unpaid self taught commentator needs to point out the evidence he doesn’t seem to be aware of? Why does a PhD need to be reminded of basic scientific principles (like, don’t argue from authority). Such is the vacuum of funding for other theories that a debate that ought to happen inside the university obviously hasn’t occurred. Such is the decrepit, anaemic state of university science that even a doctorate doesn’t guarantee a scientist can reason. Where is the rigor in the training, and the discipline in the analysis?

Credibility lies on evidence

by Joanne Nova

April 29, 2010

Reply to Andrew Glikson

Dr Andrew Glikson still misses the point, and backs his arguments with weak evidence and logical errors. Instead of empirical evidence, often […]

Co2 is the magic gas that makes plants grow

A little under half (typically about 45%) of the dry weight of any plant is carbon, and almost all that “C” came from CO2 in the atmosphere. No wonder plants love more CO2.

Trees and bushes can grow out of cracks in rocks because they suck the carbon right out of the air. Likewise hydroponics is only possible because the building blocks come from liquid and aerial fertilizer.

CO2 is about the only “pollution” you can pump around plants and watch them grow faster, stronger, taller and indeed more resistant to most of the stresses that normally bother a plant.

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