Emissions to the atmosphere of gases as a result of human activity. The term is often used to describe, but is not restricted to, the exhaust from combustion events.

Greenhouse gas emissions that result from the activities of humans, such as burning fossil fuels. (Source: Government of Canada Climate Change Site)

Emissions of greenhouse gases, greenhouse gas precursors and aerosols associated with human activities. These include burning of fossil fuels for energy, deforestation, and land-use changes that result in a net increase in emissions.