April 16, 2007 3:00 AM

Global warming expected to have dramatic impact on U.S., Canada

Climate scientists released a grim portrait Monday of the likely effects of global warming on the United States and Canada. More droughts, floods, heat waves, infectious diseases and extinctions are possible for two of the most prosperous countries on the planet, according to the North American section of the latest report by the Intergovernmental Panel on Climate Change. Poor countries in tropical Africa and Asia will be hit even harder by the effects of higher temperatures and rising sea levels.

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