Don%26#039;t greenhouse gases work in both directions? Don%26#039;t they reflect heat from the sun as well as heat from the earth, and stop it from ever entering the earth and heating it up in the first place?

A Fake Mechanism in the Stratosphere which Supposedly Creates Global Warming:
http://www.nov55.com/str.html

Watch Bob %26amp; Dana give the truth the Thumbs Down!!!

Edit: (Quote Mike) - %26quot;Visible sunlight enters the atmosphere and travels all the way to the ground, you%26#039;d agree?%26quot;
Of course your joking!! You have never seen clouds or been under them where they reflect more than one half the sun%26#039;s emissions back into space?
You can witness satellite pictures of clouds which reflect light %26amp; heat back into space here: (You can also see the thickness of the ultimate greenhouse gas)
http://weather.unisys.com/satellite/sat_... 42% 8 Votes 32% 6 Votes 11% 2 Votes

No, and anyone who says they do has a really bad understanding of basic science and how radiation works. And Roxi, as has been proven twice so far in answers to your question, you are going to have to get used to really poor and scientifically incorrect answers being spread by global warming sceptics.

I%26#039;ll simplify it a bit: Visible sunlight (and UV too) enters the atmosphere and travels all the way to the ground, you%26#039;d agree?

This radiation warms up the surface of the earth. You allow sunlight to shine on something, it gets warm, right? This is reflected back towards space as infrared radiation (heat = infrared radiation, %26quot;far infrared%26quot; radiation to be precise).

Greenhouse gases have the property of absorbing and trapping infrared radiation (not the visible stuff which came in). In other words, they trap the radiated heat from the surface of the earth.

So what%26#039;s so bad about this? Well, again to simplify things a fair bit: too little greenhouse gas is bad, and the planet will freeze. Too much greenhouse gas is bad, and the planet will boil. The proportion of greenhouse gases in the atmosphere is increasing quite quickly, and some of the more significant ones are produced in large quantities by us. This is where the debate begins.

Edit for Voice Of Reason (below):

yep OK, mea culpa, on whether the interaction of radiation with molecules is %26quot;physics%26quot; or %26quot;chemistry%26quot;. So by %26quot;a number of%26quot; you actually mean %26quot;one%26quot;, and a minor one that is completely irrelevant. Spoken like a true global warming sceptic.

On point 2, you beautifully support my first sentence - a lack of understanding of basic science and radiation! Infrared is L-O-N-G-E-R wavelength than visible, and this is very significant. Heat or thermal radiation is far-infrared, which is even longer still compared to visible light than %26quot;near%26quot; infrared. Hey, believe whatever you like - but you can%26#039;t change the spectrum of electromagnetic radiation just to suit an argument against someone else. I%26#039;ve edited the terminology anyway to prevent you getting confused even further. Are we on the right wavelength? ;) 5% 1 Vote