Humans impact the physical environment in many ways: overpopulation, pollution, burning fossil fuels, and deforestation. Changes like these have triggered climate change, soil erosion, poor air quality, and undrinkable water.
Environmental change is a phenomenon that changes the environment in which an organism lives. It can be caused by natural processes or human activities. Environmental changes are not always negative. For example, the extinction of a species may be considered as an environmental change as it leads to a new ecosystem that may not be able to support the same number of species.