As long as we are on the topic. This just came to my attention as another confounding factor being introduced into the mix by a researcher from Russia suggesting solar warming is the root cause. Not much acceptance yet. . Joe _http://news.nationalgeographic.com/news/2007/02/070228-mars-warming.html_ (http://news.nationalgeographic.com/news/2007/02/070228-mars-warming.html) <BR><BR><BR>**************************************<BR> AOL now offers free email to everyone. Find out more about what's free from AOL at http://www.aol.com.