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Answer:
In 1960, the U.S. Forest Service started keeping detailed records of damage caused by wildfires. ... Between 2000 and 2013, nearly 161 million acres were consumed by wildfires -- more in 13 years than in the previous 40 years, combined. ... they would have been had fuel sources been able to burn off naturally over time.
Missing: 225 | Must include: 225
Explanation: