Most U.S. wildfires caused by humans - Earth.com

Most U.S. wildfires caused by humans

Most U.S. wildfires are caused by humans. This Image of the Day comes thanks to the NASA Earth Observatory and illustrates a recent University of Colorado study that found that 84% of U.S. wildfires that occurred between 1992 and 2012 were caused by humans. Discarded cigarettes, unattended campfires, power lines, and arson were the most common causes.

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