What’s the deadliest natural phenomenon?

Livescience.com, recently cross-posted by the Tehran Times and Gaia Spirit Blog

This article, part of the Life’s Little Mysteries section of livescience.com, describes the hazards of natural disasters. This was apparently written in July of 2007 and has just recently been posted by others (perhaps people interested in the recent floods in the U.S. Midwest). In the article, this 1993 OTA report, Preparing for an Uncertain Climate- Volume 1, is cited and quoted as follows, “despite recent efforts, vulnerability to flood damages is likely to continue to grow”.