We have been hearing about Global Warming, Greenhouse effect, and other related things for sometime now. For the partly ignorant me, I never bothered to understand what it meant, till I read an article in TIME. The issue is dated April 3, 2006, and its cover can be found here. Online access to this article is only for TIME subscribers, though a preview can be had here.
This article clearly explains what global warming is, and how it has become a problem too severe in the recent times. With lots of illustrations, and excellent writeup, I am sure this is a great and interesting read. I have the paper copy, so let me know if you are interested in reading it, and I shall send a photocopy of the article to you.