Spam filter

This is just a quick note to let people know that I get a lot of legitimate comments caught in the spam filter here, and unfortunately I am not very conscientious about cleaning it out.

If you submit a comment and it does not appear, don't hesitate to let me know via email (see my email address here) .

I regret that this happened to a pair of comments that were submitted a couple of days ago, because the poster clearly put some time and effort into them and they also contain a lot of technical detail about IR absorbtion by CO2. They had fallen off the "Recent comments" list before they made it on the site, but have a read here.

Thanks, Peter, for the contibution. The CO2-saturation argument is still missing from my guide, but I hope to add it shortly!