Natural disasters are not considered environmental catastrophes because they are not caused by human activity.

Burning fossil fuels releases greenhouse gases into the atmosphere, which trap heat and cause the planet to warm.

Extinction is the loss of a species from the planet.

Sewage discharge is the leading cause of water pollution because it contains harmful bacteria and viruses that can contaminate drinking water sources.

Deforestation is the process of converting forests into other land uses, such as agriculture or development.

Natural gas is a fossil fuel and is therefore not a renewable energy source.

Waste reduction is the process of reducing the amount of waste produced.

Restoration is the process of restoring a damaged ecosystem to its natural state.

Oxygen is not a greenhouse gas because it does not trap heat in the atmosphere.

Remediation is the process of removing pollutants from the environment.

Deforestation is not a type of air pollution.

Conservation is the process of protecting and managing natural resources.

Groundwater depletion is not a type of water pollution.

Preservation is the process of protecting and preserving natural areas.

Natural disasters are not considered environmental catastrophes because they are not caused by human activity.