Foresters have begun burning 180,000 piles of trees in an effort to protect homes following a devastating wildfire season in Colorado last year.
The U.S. Forest Service is planning to burn 30 percent of the wood piles this winter. Foresters are waiting for more moisture to destroy the rest.
The trees have been collected because more firefighters are needed on standby if the wood is not piled up.
More than 600 homes were destroyed by wildfires in Colorado last year, and at least five people were killed.