von Dr. Indika Dilhan Somaratne
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| [1.] Ids/Fragment 029 01 - Diskussion Zuletzt bearbeitet: 2019-07-14 21:43:30 WiseWoman | Dahl 2005, Fragment, Gesichtet, Ids, SMWFragment, Schutzlevel sysop, Verschleierung |
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| The significance for the climate is that carbon dioxide, along with another carbon compound, methane, is among the most important greenhouse gases, trapping heat in the atmosphere in the same way as the glass in a greenhouse lets in light but prevents heat from escaping. Since the beginning of the industrial revolution powered by fossil fuels, the concentration of atmospheric carbon dioxide has risen from 290 to 370 parts per million (ppm), and it could easily reach 550 ppm or more in mid-century. Every ton of burned fuel oil produces 2.9 tons of carbon dioxide (CO2), while extracting the same energy from coal produces 3.8 tonnes of CO2. Deforestation and the loss of humus from degrading soils also release significant quantities of carbon dioxide to the atmosphere, representing one-third of the increase (IPCC 2004. 08-22).
While the rising levels of greenhouse gases will trap more heat and change the air circulation patterns and climate, the effects will be highly variable around the world and are not easy to predict. Using various computer models of the global climate system, more than a thousand scientists contributing to the Intergovernmental Panel on Climate Change have confirmed a significant human effect on the climate through global warming, and more is expected (IPCC 2007 b, 20-25.). While powerful political and economic interests have questioned the reality of any link between fossil fuel consumption and Climate Change, none of their arguments have withstood closer scientific scrutiny. The evidence for accelerating global warming is accumulating rapidly. The global average surface temperature has risen markedly since the late 1970s. Nine of the ten warmest years on record have occurred since 1995. The models project an even faster rise in global temperature over the next century as greenhouse gas emissions continue. The greatest temperature changes are expected in polar areas. A rise of more than 2°C in the mean global temperature could trigger negative feedbacks that would make major Climate Change irreversible, and we could reach that point by [2035 if we continue business as usual, with a rise of up to 5°C possible by the end of the century (IPCC 2007b, 20-25).] IPCC (Intergovernmental Panel On Climate Change) (2004). 16 Years Of Scientific Assessment In Support Of The Climate Convention, Anniversary Brochure. Available Online At: www.ipcc.ch/pdf/10th-anniversary/anniversary-brochure.pdf IPCC (Intergovernmental Panel On Climate Change) (2007b). Summary For Policymakers. In: Parry ML, Canziani OF, Palutikof JP, Van Der Linden PJ, Hanson CE (Eds) Climate Change 2007: Impacts, Adaptation And Vulnerability. Contributions Of Working Group II To The Fourth Assessment Report Of The Intergovernmental Panel On Climate change. Cambridge University Press, Cambridge. Also Available Online At: www.ipcc.ch/pdf/assessment-report/ar4/wg2/ar4-wg2-spm.pdf |
The significance of this for the climate is that carbon dioxide, along with another carbon compound—methane, is among the most important greenhouse gases, trapping heat in the atmosphere in the same way as the glass in a greenhouse lets in light but prevents heat from escaping.
[...] Since the beginning of the industrial revolution powered by fossil fuels, the concentration of atmospheric carbon dioxide has risen from 290 to 370 parts per million (ppm), and it could easily reach 550 ppm or more in mid-century. Every tonne of fuel oil burned produces 2.9 tonnes of carbon dioxide, while extracting the same energy from coal produces 3.8 tonnes of CO2. Deforestation and the loss of humus from degrading soils also release significant quantities of carbon dioxide to the atmosphere, representing one third of the increase. While the rising levels of greenhouse gases will trap more heat and change the air circulation patterns and climate, the effects will be highly variable around the world and are not easy to predict. Using various computer models of the global climate system, more than a thousand scientists contributing to the Intergovernmental Panel on Climate Change have confirmed a significant human effect on the climate through global warming, and more is expected. While powerful political and economic interests have questioned the reality of any link between fossil fuel consumption and climate change, none of their arguments has withstood closer scientific scrutiny. The evidence for accelerating global warming is accumulating rapidly. The global average surface temperature has risen markedly since the late 1970s. Nine of the ten warmest years on record have occurred since 1995. The models project an even faster rise in global temperature over the next century as greenhouse gas emissions continue. The greatest temperature changes are expected in polar areas. A rise of more than 2°C in the mean global temperature could trigger positive feedbacks that would make major climate change irreversible, and we could reach that point by 2035 if we continue business as usual, with a rise of up to 5°C possible by the end of the century. |
Although two sources are given, this wording is not found in either. However, it is almost verbatim from this documented source. Oddly, positive feedbacks become negative in the dissertation. |
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