Australia's National Greenhouse Accounts provide greenhouse gas emission estimates for the United Nations Framework Convention on Climate Change (UNFCCC), and for tracking Australia's progress towards its internationally agreed target of limiting emissions to 108% of 1990 levels over the period 0012Carbon dioxide (CO 2) is the primary greenhouse gas emitted through human activitiesIn 19, CO 2 accounted for about 80 percent of all US greenhouse gas emissions from human activities Carbon dioxide is naturally present in the atmosphere as part of the Earth's carbon cycle (the natural circulation of carbon among the atmosphere, oceans, soil, plants, and animals)Ozone is also a greenhouse gas, but it differs from other greenhouse gases in several ways The effects of ozone depend on its altitude, or where the gas is located vertically in the atmosphere Most ozone naturally exists in the layer of the atmosphere called the stratosphere, which ranges from approximately 6 to 30 miles above the Earth's
Ghg Emissions Environmental Reporting
