NSES Content Topic Environmental Quality Materials from human societies disturb both physical and chemical cycles of the Earth. A relatively unpolluted environment is essential to maintain the quality of life on earth. Humans have a major effect on other species. The influence of humans on other organisms occurs through ways such as land use, decreasing space available to other species, and pollution, changing the chemical composition of air, soil, and water. Natural Resources Humans use many natural systems as resources.
Natural systems do have the capacity to reuse waste, but that capacity is limited.
Changing natural systems can exceed the limits of organisms to adapt naturally or humans to adapt technologically. Stewards of the earth's resource should examine current energy sources, demands, and conservation practices to insure an adequate energy supply for future generations. NSES Content Topic Natural and Human-induced Hazards Human activities can enhance potential for hazards. Acquisition of resources, urban growth, and waste disposal can accelerate rates of natural change. Awareness of, concern for, and action on problems in the environment can result in major improvements.