Gina,  I googled this subject, and this URL shows a lot of links on the subject...I have not read them yet, and don't know if they have to do with the incoming comet, etc or not.
 
I have printed out several articles about it.  Someone posted on glf that CNN did a piece on it a week or so ago.
 
 
http://ms101.mysearch.com/jsp/GGmain.jsp?searchfor=atmosphere+getting+darker%3f
 
Send your email address (again) and I will send them to you if I can find where they came from.  I had your email, but my system crashed and I am currently on a different one.  I lost all email addresses.
 
Donna.skinner@sbcglobal.net