Environmental stressors can be divided into the following groups:-Thermal stress happens when the heat influences ecosystems. For instance, it happens near industrial discharges of heated water or natural hot-water vents on the ocean floor. -Physical stress is an intense exposure to kinetic energy. For example, hurricanes, volcanos, and explosions. -Wildfire is also a disturbance and it could lead to awful consequences. A big part of the biomass of an ecosystem is combusted and dominant species might be killed. -Climatic stress is connected with excessive or insufficient regimes of temperature, solar radiation, and moisture. Deserts and Tundra are good examples of climatic stress. At the same time, rainforests are under a relatively benign climatic regime. -Pollution happens when chemicals are present in concentrations big enough to influence organisms and cause ecological changes. Pollution can be caused by sulfur dioxide and ozone or by elements such as arsenic, and mercury. Unfortunately, pollution is often a result of human activity. -Radiation stress refers to excessive loads of ionizing energy. -Biological stresses are associated with different actions that happen to organisms of the same or different species. The harvesting and management of species and ecosystems by humans is a type of biological stress. So, the intensity of environmental stress causes significant changes and often these changes are not good. For instance, disruption of an ecosystem can lead to mortality of organisms and other ecological damage. Our environment is exposed to stress and we need to try to keep it safe.