Sentences with phrase «changes in greenhouse gas concentrations produced»

Almost all the SOD's 10.2 % error standard deviation for greenhouse gas AF relates to the AF magnitude that a given change in the greenhouse gas concentration produces, not to uncertainty as to the change in concentration.

Not exact matches

Such factors include increased greenhouse gas concentrations associated with fossil fuel burning, sulphate aerosols produced as an industrial by - product, human - induced changes in land surface properties among other things.

Anthropogenic global warming (AGW), a recent warming of the Earth's lower atmosphere as evidenced by the global mean temperature anomaly trend [11], is BELIEVED to be the result of an «enhanced greenhouse effect» mainly due to human - produced increased concentrations of greenhouse gases in the atmosphere [12] and changes in the use of land [13].

The main purpose of the first phase (development of the RCPs) is to provide information on possible development trajectories for the main forcing agents of climate change, consistent with current scenario literature allowing subsequent analysis by both Climate models (CMs) and Integrated Assessment Models (IAMs).1 Climate modelers will use the time series of future concentrations and emissions of greenhouse gases and air pollutants and land - use change from the four RCPs in order to conduct new climate model experiments and produce new climate scenarios as part of the parallel phase.

«Climate science» as it is used by warmists implies adherence to a set of beliefs: (1) Increasing greenhouse gas concentrations will warm the Earth's surface and atmosphere; (2) Human production of CO2 is producing significant increases in CO2 concentration; (3) The rate of rise of temperature in the 20th and 21st centuries is unprecedented compared to the rates of change of temperature in the previous two millennia and this can only be due to rising greenhouse gas concentrations; (4) The climate of the 19th century was ideal and may be taken as a standard to compare against any current climate; (5) global climate models, while still not perfect, are good enough to indicate that continued use of fossil fuels at projected rates in the 21st century will cause the CO2 concentration to rise to a high level by 2100 (possibly 700 to 900 ppm); (6) The global average temperature under this condition will rise more than 3 °C from the late 19th century ideal; (7) The negative impact on humanity of such a rise will be enormous; (8) The only alternative to such a disaster is to immediately and sharply reduce CO2 emissions (reducing emissions in 2050 by 80 % compared to today's rate) and continue further reductions after 2050; (9) Even with such draconian CO2 reductions, the CO2 concentration is likely to reach at least 450 to 500 ppm by 2100 resulting in significant damage to humanity; (10) Such reductions in CO2 emissions are technically feasible and economically affordable while providing adequate energy to a growing world population that is increasingly industrializing.

My personal views are: (1) Yes, it is true that increasing greenhouse gas concentrations will tend to warm the Earth's surface and atmosphere; (2) Yes, human production of CO2 is producing significant increases in CO2 concentration; (3) The rates of change of temperature in the previous two millennia are uncertain because proxies have been misapplied by the hockey stick crowd.

Anthropogenic global warming (AGW), a recent warming of the Earth's lower atmosphere as evidenced by the global mean temperature anomaly trend [9], is believed to be the result of an «enhanced greenhouse effect» mainly due to human - produced increased concentrations of greenhouse gases in the atmosphere [10] and changes in the use of land [11]..

In fact, among the 900 scenarios the report authors examined, if greenhouse gas concentrations remain above current levels in 2030, «many models... could not produce scenarios reaching atmospheric concentration levels that make it as likely as not that temperature change will remain below 2 °C relative to pre ‐ industrial levels.&raquIn fact, among the 900 scenarios the report authors examined, if greenhouse gas concentrations remain above current levels in 2030, «many models... could not produce scenarios reaching atmospheric concentration levels that make it as likely as not that temperature change will remain below 2 °C relative to pre ‐ industrial levels.&raquin 2030, «many models... could not produce scenarios reaching atmospheric concentration levels that make it as likely as not that temperature change will remain below 2 °C relative to pre ‐ industrial levels.»