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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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Global Warming & nitrogen trifluoride
"Cliff" wrote in message ... http://ap.google.com/article/ALeqM5i...nUBaAD94148DG0 [ 2 greenhouse gases on the rise worry scientists By SETH BORENSTEIN - 14 hours ago WASHINGTON (AP) - Carbon dioxide isn't the only greenhouse gas that worries climate scientists. Airborne levels of two other potent gases - one from ancient plants, the other from flat-panel screen technology - are on the rise, too. And that's got scientists concerned about accelerated global warming. The gases are methane and nitrogen trifluoride. Both pale in comparison to the global warming effects of carbon dioxide, produced by the burning of coal, oil and other fossil fuels. In the past couple of years, however, these other two gases have been on the rise, according to two new studies. The increase is not accounted for in predictions for future global warming and comes as a nasty surprise to climate watchers. Methane is by far the bigger worry. It is considered the No. 2 greenhouse gas based on the amount of warming it causes and the amount in the atmosphere. The total effect of methane on global warming is about one-third that of man-made carbon dioxide. ] ..... [ It's still early and the data are far from conclusive, but scientists say they are concerned that what they are seeing could be the start of the release of the Arctic methane. After almost eight years of stability, atmospheric methane levels - measured every 40 minutes by monitors near remote coastal cliffs - suddenly started rising in 2006. The amount of methane in the air has jumped by nearly 28 million tons from June 2006 to October 2007. There is now more than 5.6 billion tons of methane in the air. ] .... [ Still, methane and the potential of future increases is a worry, Weiss and others say. Its recent increase coincides with anecdotal evidence of more methane being released in the shallow parts of the Arctic Ocean. A scientific survey in late summer found methane levels in the east Siberian Sea up to 10,000 times higher than normal, said Orjan Gustafsson, an environmental scientist at Stockholm University who has just returned from the six-week survey. Prinn's data are consistent with the early results of "whole fields of methane bubbles" that Gustafsson said he found last month. ] So then. The sky is really falling? Again. I do not think ANYBODY can assemble a model that includes all the necesary factors, nor do I believe that anybody could manage to collect all the data required, much less sort out the relationships - forget about extracting meaningful trends and accurate predictions. (They still can't predict tornadoes or hurricaines with any degree of acuracy beyond a few days into the future, can they? And such as they do, they do only after the thing has formed and made itself apparent.) Global Warming Denier? Me? No, nor am I a global cooling denier. I just think that it is far too complex for anyone to state with any degree of certainty worthy of staking the future of the entire civilized world on an assumption rendered in a half an hour of computer-time, no matter how highly the prognosticators think of themselves or of their wizzardry. Show me one who has absolutely no bias. Let the flames begin. Please, however, those for whom any discussion cannot rise above name-calling and profanity --- go make yourself a tall iced-tea and sit this one out. Flash |
#2
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Global Warming & nitrogen trifluoride
In article , "Flash"
wrote: The total effect of methane on global warming is about one-third that of man-made carbon dioxide. But the #1 greenhouse gas is and has always been H2O ;( Free men own guns - www(dot)geocities(dot)com/CapitolHill/5357/ |
#3
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Global Warming & nitrogen trifluoride
On Sun, 26 Oct 2008 06:10:16 -0600, the infamous nick hull
scrawled the following: In article , "Flash" wrote: The total effect of methane on global warming is about one-third that of man-made carbon dioxide. But the #1 greenhouse gas is and has always been H2O ;( Yeah, and let the GlobalWarmingKumbayaers just try to ban THAT. -- Some days, it's not even worth chewing through the restraints. |
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