Global warming is one of the most important issues of our time. Several years ago, I wrote a piece on global warming and submitted it to the Opinion section of the San Diego Union-Tribune. The article was rejected and returned to me unpublished.

Disappointed but not undaunted, I sought the advice of a friend, who recommended that I submit the article to the Science section of the paper instead. Here again, the article ran into trouble: It was too straightforward, too simple, to constitute a veritable scientific piece.

By now, the issue of global warming has made it to the mainstream of public discourse. Yet, sorting through the myriad facts and opinions remains a challenge for many people. Nevertheless, the world continues to warm up.¹