2010-10-14 23:46:09Basic Rebuttal 71: Has the greenhouse effect been falsified? - 1st draft
gpwayne
Graham Wayne
graham@gpwayne...
217.44.218.133
Throwing Stones at the Greenhouse Effect

Basic Rebuttal 71: Has the greenhouse effect been falsified?

Some climate change skeptics dispute the so-called ‘greenhouse effect’, which keeps the surface temperature of the Earth approximately 30 degrees C warmer than it would be if there were no greenhouse gases in the atmosphere. In other words, without the greenhouse effect, the Earth would be largely uninhabitable.

How do we know for sure this effect is real? The principle is demonstrated through basic physics, because a bare rock orbiting the sun at the distance of the Earth should be far colder than the Earth actually is. The explanation for this observation was based on the work of John Tyndall, who discovered in 1859 that several gases, including carbon dioxide and water vapour, could trap heat. This was the first evidence for what we know now as greenhouse gases. Then, towards the end of the same century, a Swedish scientist named Svante Arrhenius proved the relationship between greenhouse gas concentrations and surface temperatures.

Empirical Evidence for the Greenhouse Effect

We only have to look to our moon for evidence of what the Earth might be like without an atmosphere that sustained the greenhouse effect. While the moon’s surface reaches 130 degrees C in direct sunlight at the equator (266 degrees F), when the sun ‘goes down’ on the moon, the temperature drops almost immediately, and plunges in several hours down to minus 110 degrees C (-166F).

Since the moon is virtually the same distance from the sun as we are, it is reasonable to ask why at night the Earth doesn’t get as cold as the moon. The answer is that, unlike the Earth, the moon has no water vapour or other greenhouse gases, because of course it has no atmosphere at all. Without our protective atmosphere and the greenhouse effect, the Earth would be as barren as our lifeless moon; without the heat trapped overnight in the atmosphere (and in the ground and oceans) our nights would be so cold that few plants or animals could survive even a single one.

The most conclusive evidence for the greenhouse effect – and the role CO2 plays – can be seen in data from the surface and from satellites. By comparing the Sun’s heat reaching the Earth with the heat leaving it, we can see that less long-wave radiation (heat) is leaving than arriving (and since the 1970s, that less and less radiation is leaving the Earth, as CO2 and equivalents build up). Since all radiation is measured by its wavelength, we can also see that the frequencies being trapped in the atmosphere are the same frequencies absorbed by greenhouse gases.

Disputing that the greenhouse effect is real is to attempt to discredit centuries of science, laws of physics and direct observation. Without the greenhouse effect, we would not even be here to argue about it.
2010-10-15 01:03:48
nealjking

nealjking@gmail...
91.33.104.180
Looks good!
2010-10-15 01:37:03Great Job
Robert Way

robert_way19@hotmail...
137.122.14.20
I think its great. Only thought would be to add in a line saying that using these same satellite measurements we have been able to determine that less LW radiation is escaping to the atmosphere since the 1970s.
2010-10-15 02:13:56
doug_bostrom

dbostrom@clearwire...
184.77.83.151
That was nice and quick.
2010-10-15 02:32:30
CBW
Bruce Worden
cbw723@gmail...
24.205.64.214
Looks good to me. The one technical nit-pick I have is that most of the energy arriving from the sun isn't long-wave IR. You could say something more generic like "..less energy (heat) is leaving..." or "thermal energy" or the like.
2010-10-15 02:58:39Revisions
gpwayne
Graham Wayne
graham@gpwayne...
217.44.218.133

Thanks all - Robert & CBW, sure thing, points addressed.

Neal - got a thumb to go with that?

2010-10-15 03:11:39OK
nealjking

nealjking@gmail...
91.33.104.180
Yes, I just wanted to see if anybody caught anything I cared about...
2010-10-15 10:55:21
Rob Painting
Rob
paintingskeri@vodafone.co...
118.93.222.176
Looks sweet to me.
2010-10-17 04:06:04
Paul D

chillcast@googlemail...
82.18.130.183
Nice and straight forward.
2010-10-17 10:16:38
Riccardo

riccardoreitano@tiscali...
93.147.82.169
As eaasy to understand as it can be, I think.