 Environmental degradation is the deterioration of the environment through depletion of resources such as air, water and soil, the destruction of ecosystems, habitat destruction, the extinction of wildlife, and pollution. It is defined as any change or disturbance to the environment perceived to be deleterious or undesirable. As indicated by the I-equals PAT equation, environmental impact I or degradation is caused by the combination of an already very large and increasing human population P continually increasing economic growth or per capita the affluence A and the application of resource depleting and polluting technology T. Environmental degradation is one of the 10 threats officially cautioned by the high-level panel on threats, challenges and change of the United Nations. The United Nations International Strategy for Disaster Reduction defines environmental degradation as the reduction of the capacity of the environment to meet social and ecological objectives and needs. Environmental degradation is of many types. When natural habitats are destroyed or natural resources are depleted, the environment is degraded. Efforts to counteract this problem include environmental protection and environmental resources management.