![Startingin1972，theNationalParkServiceestablishedapolicy...]( "Startingin1972，theNationalParkServiceestablishedapolicy...")
- 问题详情：Startingin1972，theNationalParkServiceestablishedapolicyforforestfirescalledNaturalBurn.Itwasacknowledgedthatsomeforestfires,suchasthosecausedbylightningwerenecessaryforforeststomaintainbalancedecosystems,sothefireshouldbeallowedtoburn.However,...
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