What do you think of this Global Warming experiment?

The experiment does not control the wavelength of the illumination and the choice of materials for the greenhouse models is not discussed. The light intensity in the visible was controlled, but only indirectly relevant. Both gases interact with specific wavelengths in the mid infrared region. Different types of detectors are needed to measure visible and infrared radiation. Because one detector was used and visible was measured, IR was not measured. The greenhouse effect on earth is caused by a reduction in the flux of blackbody radiation to space by the atmosphere. The type of radiation critical to the interpreting the experiment in terms of a greenhouse effect was not measured at all. The experiment worked only because the light intensity is indirectly related to the bulb temperature. The bulb, which looks like a halogen, gets hot and emits IR. If a fluorescent bulb, which has a lower surface temperature was used, the experiment would likely have had a null result because the crude measurement would not pick up the smaller effect. A bolometer would work better than a thermometer. The sensitivity of a bolometer is about 0.001 K. The shell of the greenhouse models appears to be wood with a polyethylene covering. Polyethylene is an infrared window. If glass was used instead (absorbs strongly a wavelengths > 6 microns), the experiment would likely have a null result because the glass would absorb and re-radiate most of the IR back into the room. The IR flux inside would only increase a bit because the glass would warm up by a small amount. Overall the experiment is badly planned and the result is fortuitous. The experiment proves that CO2 and CH4 interact with light. Nothing more.

A much better experiment would be to measure the cooling rate of a hot body representing warm earth in boxes with different atmospheres.

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It shows that in a closed system CO2 has a minor effect on temperature. Of course we all know that the earth is an open system where heat can radiate back into space.

I think it is not very good. Global warming is real and caused by CO2, but these experiments have little to do with that. The experimental conditions are so unlike the atmosphere, that no conclusions should be drawn from this. Look at the work of real scientists instead of faux demonstrations.

See the (hi-def) video called "HOME" at..........http://www.youtube.com/watch?v=jqxENMKaeCU.....

It is about our earth and we humans and it addresses,specifically,some of the issues in this question......(and it is far better than the Youtube Video recommended)

and enjoy!

I'm most certain the world always goes through climate changes.

Al Gore and his scientists that back him are just con men and that is why he is unwilling to debate it. Also why would he buy a multimillion dollar home where according to his alleged facts will be flooded?

the redundancy and accuracy of Mythbusters experiments leave much to be desired. we already know of the greenhouse effect. we know CO2 in our atmosphere is what keeps the Earth from freezing over. we also know that too much CO2 can lead to conditions that are not conducive to human life at current levels. CO2 levels are exceeding far over what they have ever been in the past, so it is safe to say we are in uncharted territories. man made global warming will be a true trial of man kind's existence, as well as many other species.

EDIT

d/dx+d/dy+d/dz, you just blew my mind. knowledge is power! :D

Mythbusters appear to be much more entertainment oriented than science oriented. They claim they have over 30 years of combined experience tricking people and cameras.

Pretty straightforward experiment I guess!