But the U.S. Journal of Environmental Management says park visitation has dropped by 25 percent in the past 16 years. High fuel costs are a popular culprit.
But the U.S. Journal of Environmental Management says park visitation has dropped by 25 percent in the past 16 years. High fuel costs are a popular culprit.
但是美国环境管理杂志称在过去的16年里国家公园的游览量下降了25个百分点。高额油价是一个被普遍认可的罪魁祸首。