Proof Greenhouse Gases COOL the Earth



NASA scientists claimed Cirrus clouds, formed by contrails from aircraft engine exhaust, are capable of increasing average surface temperatures enough to account for the warming trend in the United States that occurred between 1975 and 1994.
“According to Patrick Minnis, a senior research scientist at NASA’s Langley Research Center in Hampton, Va., there has been a one percent per decade increase in cirrus cloud cover over the United States, likely due to air traffic. Cirrus clouds exert a warming influence on the surface by allowing most of the sun’s rays to pass through but then trapping some of the resulting heat emitted by the surface and lower atmosphere.

This explanation is wrong. These clouds will cool the earth, not warm it. There is more radiant energy coming from the sun to the earth than from the earth to the sky. More radiant energy will be blocked during the day than will be blocked leaving the earth at night (insulating effect). The overall effect is cooling, not warming.

This cooling effect of water vapor was proved following the 9-11 terrorist attacks. Atmospheric scientists studied the effect of water vapor on temperature in the wake of the attacks. The Federal Aviation Administration (FAA) prohibited commercial aviation over the United States for three days following the attacks and this presented a unique opportunity to study the temperature of the earth without airplanes and their contrails.

Dr. David Travis, an atmospheric scientist at the University of Wisconsin, along with two other scientists, looked at how temperatures for those three days compared to other days when planes were flying. They analyzed maximum and minimum temperature data from about 4,000 weather stations throughout the conterminous (48 states) United States for the period 1971–2000, and compared those to the conditions that prevailed during the three-day aircraft grounding period and the three days when planes were flying before and after the grounding period. This research effort was sponsored by grants from the National Science Foundation.

They found that the average daily temperature range between highs and lows was 1.1 degrees C higher during September 11-14 (shown graphically in Figure 2) compared to September 8-11 and September 14-17 with normal air traffic.

The data proved that contrails (condensed water vapor trails) have a net cooling effect. You cannot just look at a nighttime effect only, like the IPCC climatologists and meteorologists have done, both day and night must be included to determine the overall effect. Water vapor, CO2 and particulates in the atmosphere all reflect as well as scatter some radiant energy back to outer space and this causes cooling.

Here is a simple test, go outside when the sun is shining, see how warm you feel when you are in the direct sunlight and compare that with how warm you feel when a cloud goes overhead and you are in the shade of the cloud. Of course you feel cooler in the shade of the cloud; a child knows this. So Dr. Travis confirmed this with scientific analysis of real data that most people on this planet already know.

If you are cooler when under the microscopic water droplets of a cloud why would any scientist ever say that water vapor when more diluted makes the earth warmer? This completely defies logic and common sense. If what they call the greatest greenhouse gas (water vapor) causes cooling then clearly all other named greenhouse gases like carbon dioxide, methane, nitrous oxide, and chlorofluorocarbons, etc. cool the atmosphere as well.

Everyone also knows that cloud cover at night (more insulation) prevents the earth from cooling off as fast as it does when there are no clouds. However, on a relatively clear night if a cloud goes overhead you cannot feel any warming effect of the cloud, so this insulating effect is shown to be minimal compared to the daytime effect. Another simple observation that shows Minnis and other warming supporters have it backwards.

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