Carbon dioxide (CO2) is the primary greenhouse gas emitted by human activities, primarily through the burning of fossil fuels for energy production and transportation.

Sulfur dioxide (SO2) is primarily responsible for acid rain, which is caused by the reaction of SO2 with water vapor and oxygen in the atmosphere.

The greenhouse effect is the ability of Earth's atmosphere to absorb and trap heat, primarily due to the presence of greenhouse gases such as carbon dioxide and methane.

Solar energy is a sustainable energy source because it is derived from the sun and does not produce greenhouse gases or other pollutants.

Global warming refers to the gradual increase in Earth's average temperature, primarily due to the enhanced greenhouse effect caused by human activities.

Vehicular emissions, particularly from gasoline-powered vehicles, are a major contributor to air pollution in urban areas, releasing pollutants such as carbon monoxide, nitrogen oxides, and particulate matter.

Chlorofluorocarbons (CFCs) are the primary cause of ozone depletion in the stratosphere. These human-made chemicals were widely used in refrigeration, aerosols, and foam-blowing agents before being phased out due to their harmful effects on the ozone layer.

Crop rotation is a sustainable agricultural practice that involves growing different crops in the same area in sequential seasons. It helps maintain soil fertility, reduce the risk of pests and diseases, and improve overall crop yields.

Carbon capture and storage (CCS) is the process of capturing carbon dioxide from industrial sources and storing it underground or in geological formations to prevent its release into the atmosphere.

Industrial emissions, particularly from the burning of fossil fuels for energy production and manufacturing, are a major contributor to climate change by releasing large amounts of greenhouse gases into the atmosphere.

Ocean acidification refers to the gradual decrease in the pH of Earth's oceans, primarily due to the absorption of carbon dioxide from the atmosphere. This process has significant implications for marine ecosystems and biodiversity.

Selective logging is a sustainable forestry practice that involves harvesting only mature trees while leaving younger trees and other vegetation intact. This helps maintain forest biodiversity and ecosystem health.

Carbon pricing is a policy mechanism that puts a price on carbon emissions, incentivizing industries and consumers to reduce their emissions and transition to cleaner energy sources.

Agricultural activities, such as livestock production and the use of fertilizers, can contribute to air pollution in rural areas by releasing pollutants such as ammonia, methane, and nitrous oxide.

Carbon sequestration refers to the process of capturing and storing carbon dioxide from the atmosphere, often through the planting of trees or other vegetation that absorb and store carbon dioxide during photosynthesis.