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Editor's note: This article is the last of a three-part series by John Carey. Part 1, " Storm Warning: Extreme Weather Is Caused by Climate Change ," was posted on June 28.

There were more tornado deaths in April than any other time in history. The cause is unknown, but the damage is enormous. The weekend's tornado in Joplin, Mo., was just the latest--and most devastating--of what has been a rash of tornadoes.

By Deborah Zabarenko, Environment Correspondent WASHINGTON (Reuters) - Heavy rains, deep snowfalls, monster floods and killing droughts are signs of a "new normal" of extreme U.S. weather events fueled by climate change, scientists and government planners said on Wednesday