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To: RMF who wrote (51565)	8/25/2013 2:50:34 AM
From: FJB	1 Recommendation Recommended By Brian Sullivan Read Replies (1) \| Respond to of 85487

The Carbon Pollution Lie Carbon dioxide (CO2) is a colourless, non-toxic natural gas occurring in trace amounts in our atmosphere. It is crucial to all life on earth. Plants extract CO2 from the air and all animals get their carbon based proteins, sugars and fats from plants. CO2 is also the source of that other crucial gas of life – oxygen. Plants use solar energy and the magic of photosynthesis to extract carbon from carbon dioxide and release the oxygen back to the air. Human activity completes the carbon cycle of life by burning the carbon food and fuels for energy and releasing CO2 back to the atmosphere. Currently for every million molecules of air there are about 390 molecules of CO2 – a tiny amount which is almost the lowest it has ever been in the long history of the planet. At just 150 parts per million, plants starve and plant growth ceases. Most life probably evolved at levels of 1,000 ppm or more. The dinosaurs flourished in air with 1,800 ppm of CO2. 400 million years ago, life flourished with 4,500 ppm CO2. US Submariners live comfortably in air with 8,000 ppm and human lungs exhale air with 40,000 ppm. At what level does this gas of life morph into “pollution” and attract a carbon tax? Or is the term “carbon pollution” just another misleading Wongism? canadafreepress.com The following summarizes levels of CO2 under various conditions: 40,000 ppm: The exhaled breath of normal, healthy people. 8,000 ppm: CO2 standard for submarines 2,500 ppm: CO2 level in a small hot crowded bar in the city 2,000 ppm: The point at which my CO2 meter squawks by playing Fur Elise 1,000 to 2,000 ppm: Historical norms for the earth's atmosphere over the past 550 million years 1,000 to 2,000 ppm: The level of CO2 at which plant growers like to keep their greenhouses 1,000 ppm: Average level in a lecture hall filled with students 600 ppm: CO2 level in my office with me and my husband in it 490 ppm: CO2 level in my office working alone 390 ppm: Current average outdoor level of CO2 in the air 280 ppm: Pre-industrial levels in the air, on the edge of "CO2 famine" for plants 150 ppm: The point below which most plants die of CO2 starvation

To: RMF who wrote (51565)	8/25/2013 8:11:40 AM
From: Bearcatbob	1 Recommendation Recommended By longnshort Read Replies (1) \| Respond to of 85487

RMF, The key words in your question are: "...ANY difference?" All I know is that whatever the difference may be - it is not what the scaremongers are lying/screaming about. Bob

To: RMF who wrote (51565)	8/25/2013 1:41:01 PM
From: Brumar89	3 Recommendations Recommended By Brian Sullivan FJB greenspirit Read Replies (1) \| Respond to of 85487

Pretty much. The earth is fortunate humans came along and released a lot of fossil carbon. Geological processes have been locking up carbon for millions of years and during the last few ice ages, plants were suffering from carbon starvation. You know what most of UNglaciated North America was like during the worst of the last ice age? Think Gobi desert. One, vast amounts of water were locked up in ice sheets and, two, atmospheric carbon levels were approaching the limit of what plants need to survive: Carbon starvation in glacial trees recovered from the La Brea tar pits, southern California Pertenece a: PubMed Central (PMC) PubMed Central (PMC3 - NLM DTD) Descripción: The Rancho La Brea tar pit fossil collection includes Juniperus (C3) wood specimens that 14C date between 7.7 and 55 thousand years (kyr) B.P., providing a constrained record of plant response for southern California during the last glacial period. Atmospheric CO2 concentration ([CO2]) ranged between 180 and 220 ppm during glacial periods, rose to ?280 ppm before the industrial period, and is currently approaching 380 ppm in the modern atmosphere. Here we report on ?13C of Juniperus wood cellulose, and show that glacial and modern trees were operating at similar leaf-intercellular [CO2](ci)/atmospheric [CO2](ca) values. As a result, glacial trees were operating at ci values much closer to the CO2-compensation point for C3 photosynthesis than modern trees, indicating that glacial trees were undergoing carbon starvation. In addition, we modeled relative humidity by using ?18O of cellulose from the same Juniperus specimens and found that glacial humidity was ?10% higher than that in modern times, indicating that differences in vapor-pressure deficits did not impose additional constrictions on ci/ca in the past. By scaling ancient ci values to plant growth by using modern relationships, we found evidence that C3 primary productivity was greatly diminished in southern California during the last glacial period. biblioteca.universia.net