We can run in circles all day on this subject. The greenhouse effect and global warming are educated guesses and can no more be proven than chicken little flapping his wings screaming the sky is falling. For every statement that one of you cites a theory that the earth is getting warmer from CO2 or meteors falling, I can pull up something from the past with an unusual warming or cooling trend that happened because of jet streams or ocean currents, that had absolutely nothing to do with greenhouse gases. So on that note, I am done on this subject. Have fun.
RossRichard
Please explain to me how warming of the past has anything to do with climate change as a result of man's emission of CO2 into the air. No scientist has ever claimed that other factors do not contribute to Earths natural cooling and warming cycle. Greenhouse gasses act as a multiplier. Would Earth be warming up naturally currently if man-made CO2 emissions were not being pumped into the atmosphere? I don't know. But man-made emissions certainly do play a process in speeding it up. As stated before, this is a fallacious argument known as a red herring. You are tyring to disprove something by showing something completely different is true that really has nothign to do with the thing you are trying to disprove.When methane(CH4), a colourless odorless gas formed by the decomposition of plant and animal matter, is burned in an engine combustion, or rapid oxidization, occurs forming carbon dioxide (CO2) and water (2H2O). Other fossil fuels, which are hydrocarbon based, have similar makeups and chemistry. The greenhouse effect occurs because some of the gases in the atmosphere, including both CO2 and water vapour, are able to absorb infrared radiation. While the energy the Earth receives from the Sun is mostly in the short (Ultraviolet) wavelength the energy that is re-emitted by the Earth's surface back out into space is in the long (Infrared) wavelength due to the temperature of the Earth's surface. Oxygen and nitrogen, the major gases in the atmosphere, do not have the ability to absorb IR radiation. However when infrared radiation strikes a molecule such as carbon dioxide it causes the bonds to bend and vibrate, known as the absorption of IR energy, and gain kinetic energy which it transfers to other molecules. The greater the concentration of these greenhouse gases that are in the atmosphere the greater this effect will be and the warmer the planet will become.
http://www.kcvs.ca/site/projects/common_files/IR_Spectrum/IR_spec5.swf
A link to a flash file dealing with greenhouse gasses (including water vapour) and radiative wavelength absorption.
It is well known that water vapour is the most dominant greenhouse gas in the atmosphere. The level of water vapour in the atmosphere is a function of temperature. This means that the more you increase the temperature of a given area the more evaporation will take place in that area and the greater amount of water vapour that area will be able to hold. This would result in rising temperatures which would increase commulatively until some other external force acts upon it. When other greenhouse gasses are added to the equation it amplifies this effect by increasing the transfer of heat.
Greenhouse gas absorption occurs in multiple levels of the atmosphere. It is not only limited to one layer. As the radiation re-emitted by the Earth's surface moves up layer by layer through the atmosphere some is stopped in each layer until eventually the energy reaches a layer so thin the radiation can escape into space unimpeded. When stopped, the molecule may radiate the energy back out into a random direction or it may transfer this energy into velocity in collisions with other air molecules, as explained above. As you add more greenhouse gases to the atmosphere and saturate the lower levels with greenhouse gases the mean radiating level of the planet will be set to higher altitudes. Approximately 99.13% of water vapour exists in the troposphere while CO2 can exist throughout the atmosphere.
A Saturated Gassy Argument
Increased Concentration and Vertical Distribution of Carbon Dioxide in the Stratosphere
Also, perhaps you should look up the Eocene-Paleocene Thermal Maximum, a period in history with climate change as a result of methane, another greenhouse gas, being pumped into the atmosphere by natural means. As a result of the approximately 6 degree temp increase throughout the world there was a mass extinction event.
Log in to comment