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Politics : Formerly About Advanced Micro Devices -- Ignore unavailable to you. Want to Upgrade?

To: RetiredNow who wrote (752504)	11/12/2013 8:00:18 PM
From: Brumar89	Read Replies (1) \| Respond to of 1575939

The fraudsters were the big names pushing CAGW. Things to consider: CO2 is a trace gas. It's actually quite low and during ice ages, plants are undergoing carbon starvation: 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 ppmin 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 Greenhouses and commercial indoor growers of plants boost CO2 up into the thousands of ppm. In addition to being a trace gas, it's a minor greenhouse gas. Purveyors of doom assume the greenhouse effect of CO2 will be tripled or quadrupled by positive feedback effects on other GHG's. But there's reason to think the true feedback effects are actually negative, countering the GH effect of CO2 alone. The earth has been warmer for much of the past interglacial. The holocene optimum was a period of higher temps than now and conditions were beneficial for life and humankind. The current (past couple centuries) warming looks like a normal recovery from the little ice age. IOW there is no real sign of any crisis on the horizon. There are people who want to use predictions of doom to boost a political or economic program. Some of these are leftists, others are outfits that will profit from carbon controls. Recall that Enron was a big proponent of carbon trading. There are big forces on Wall street that would like to see carbon trading too.