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hill sky cloud orange nature outdoor landscape beautiful spectacular strange mountain grassland hill desert wilderness uninhabited area surface landform geography environment ecology protection sustainable development natural resources mineral resources energy resources water resources land resources forest resources biological resources climate change global warming environmental pollution ecological destruction loss of biodiversity desertification soil erosion soil loss mineral resources枯竭 energy resources枯竭 water resources枯竭 land resources枯竭 forest resources枯竭 biological resources枯竭