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Author: Richard Black
Cited by: David Price 0:36 AM 25 March 2009 GMT
Citerank: (9) 14746Earth has been warmer in recent past prior to human impactThe Earth was warmer in the recent past – i.e. prior to any anthropogenic forcing – than it is now.1198CE71, 14791Increase in CO2 has always followed not led rises in temperatureIce-cores dating back nearly one million years show a pattern of temperature and CO2 rise at roughly 100,000-year intervals. But the CO2 rise has always come after the temperature rise, not before, presumably as warmer temperatures have liberated the gas from oceans.1198CE71, 14797Water vapour impact far outweighs impact of CO2Water vapour is the most significant greenhouse gas, accounting for around 98% of the Earth's natural greenhouse warming effect. So changes in carbon dioxide or methane concentrations will have a relatively small impact.1198CE71, 14798Significance of water vapour effect is overstatedThe statement that water vapour is "98% of the greenhouse effect" is simply false. In fact, it does about 50% of the work; clouds add another 25%, with CO2 and the other greenhouse gases contributing the remaining quarter.13EF597B, 25357Earth has been warmer in recent pastThe Earth has been warmer in the recent past than it is now.1198CE71, 25358CO2 rises have always followed not led temperature increasesIce-cores dating back nearly one million years show a pattern of temperature and CO2 rise at roughly 100,000-year intervals. But the CO2 rise has always come after the temperature rise, not before, presumably as warmer temperatures have liberated the gas from oceans.1198CE71, 25359CO2 effect is minimal relative to water vapour effectWater vapour is the most significant greenhouse gas, accounting for around 98% of the Earth's natural greenhouse warming effect. So changes in carbon dioxide or methane concentrations will have a relatively small impact.1198CE71, 25380Example of satellite measurements of the troposphereComputer models used by IPCC predict that troposphere should be warming faster than the Earth's surface. The observational data from satellites is not consistent with this.1198CE71, 25400Significance of water vapour effect is overstatedThe statement that water vapour is "98% of the greenhouse effect" is simply false. In fact, it does about 50% of the work; clouds add another 25%, with CO2 and the other greenhouse gases contributing the remaining quarter.13EF597B URL: |