Let me know when you find some actual published material that challenges the claim.
The I got a reply from the member of physicsforum.com regarding your question. Here it is...
The paper you mention is a real oddity. Working scientists have mostly just ignored it. As it turns out, however, there is a rebuttal in press. It is:
Joshua Halpern, Christopher M. Colose, Chris Ho-Stuart, Joel D. Shore, Arthur P. Smith, Jörg Zimmermann (2010) Comment On "Falsification of the Atmospheric CO2 Greenhouse Effects within the Frame of Physics", (to appear in) International Journal of Modern Physics (B), Vol 24, Iss 10, March 30 2010.
Full disclosure. I am a co-author. It will be out at the end of the month, I am told. You can tell your friend/debate-colleague that it is normal to have some lead time in scientific publishing. This rebuttal took a while to appear for a couple of reasons, many of which are beyond our control. We didn't start on it until a few months after the original appeared.
Apart from that, the "claim" itself is dealt with quite satisfactorily in pretty much any undergraduate level text book on atmospheric physics. There are quite a number available, and an easy way to get one in print is just pop into your local University library. Most should allow visitors. Contrary to the claims of Gerhard Gerlich and Ralf D. Tscheuschner, the atmospheric greenhouse effect is entirely spontaneous, and all the net energy flow, and the net heat flow, is always from hot places to cooler ones. With the greenhouse effect, the net radiant heat flow between the surface and the atmosphere is upwards, consisting of a lack downwards back radiation (directly measured) and an even larger upwards thermal radiation (which G&T ignore) plus some additional upwards energy flow by convection and latent heat of evaporation.
The "conduction" that G&T speak of is irrelevant. It's negligible (still air is a good insulator), it has no role in the greenhouse effect, and it is upwards as well anyway.
An important and pretty readable paper that explains the relevant energy flows much more accurately than G&T is:
Trenberth, K.E., Fasullo, J.T., and Kiehl, J. (2009) Earth’s Global Energy Budget, in Bulletin of the AMS, Vol 90, pp 311-323.
I highly recommend it if you want to talk about energy flows with your biochemist friend/acquaintance. It is *the* major reference on Earth's energy budget, and this is the one you can give right now.
If it conflicts with G&T, it is simply because G&T are wrong. It is not in response to G&T, of course. For that you have to wait until March 30.
It appears we have a lot to look forward to. Strap on your seatbelt palerider, it looks like you're in for a bumpy ride.
And with your hemorrhoids, it ain't gonna be pretty.