Emissions refer to the release of substances, primarily greenhouse gases such as carbon dioxide (CO₂), methane (CH₄), nitrous oxide (N₂O), and fluorinated gases, into the atmosphere. These emissions originate from various human activities, including the combustion of fossil fuels in vehicles, power plants, and industrial processes, as well as from agriculture, deforestation, waste management, and land-use changes. Greenhouse gas emissions trap heat in the Earth’s atmosphere, intensifying the natural greenhouse effect, leading to global warming and climate change. They are often categorized into direct emissions, which come from sources owned or controlled by an entity, and indirect emissions, resulting from the generation of purchased electricity consumed by that entity. Natural processes also emit greenhouse gases; however, the current concern centers on anthropogenic emissions—those caused by human activity—which have significantly increased atmospheric greenhouse gas concentrations since the industrial revolution. Monitoring and reducing emissions is essential to mitigate climate change and its adverse environmental and societal impacts.
Back to Climate Change Encyclopedia Index Page