Carbon dioxide is the primary greenhouse gas emitted by human activities, primarily through the burning of fossil fuels.

Agriculture, particularly the clearing of forests for farming and grazing, is the largest contributor to deforestation.

Extinction is the term used to describe the loss of biodiversity, referring to the disappearance of species from the Earth.

Burning fossil fuels releases carbon dioxide into the atmosphere, which dissolves in the ocean and forms carbonic acid, leading to ocean acidification.

Global warming is the term used to describe the phenomenon of rising global temperatures, primarily caused by the increase in greenhouse gases in the atmosphere.

Burning fossil fuels, particularly for energy production and transportation, is the primary cause of air pollution.

Urbanization is the term used to describe the process of converting natural areas into developed areas, typically for residential, commercial, and industrial purposes.

Agricultural runoff, containing fertilizers, pesticides, and animal waste, is the primary cause of water pollution.

Glacial retreat is the term used to describe the phenomenon of the melting of glaciers and ice sheets, primarily due to rising global temperatures.

Refrigeration and air conditioning, which use chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs), are the primary cause of ozone depletion.

Sea level rise is the term used to describe the phenomenon of rising sea levels, primarily due to the thermal expansion of ocean water and the melting of glaciers and ice sheets.

Agriculture, particularly intensive farming practices, is the primary cause of soil erosion.

Permafrost thaw is the term used to describe the phenomenon of the thawing of permafrost, which is frozen ground in polar and subpolar regions.

Consumer products, such as single-use plastics and packaging, are the primary cause of plastic pollution.

Coral bleaching is the term used to describe the phenomenon of the loss of coral reefs, primarily due to rising sea temperatures and ocean acidification.