These emissions are also known as non-Anthropogenic Emissions. They are not caused by human activity (e.g. the emissions from an erupting volcano or geyser).
These are emissions that result from human activities (e.g. the emissions from the combustion of petrol in an automobile) as opposed to emissions that occur naturally (biogenic emissions).
development that meets the needs of the present without compromising the ability of future generations to meet their own needs. Refer to About Sustainability.