The term refers to three concepts in the literature, resource evaluation and captures  carbon cycle on a global level through synthesis evidence about emissions fossil fuels and cement, about emissions from land use change , about interceptions WHAT ₂ in oceans and on land. and the resulting rate of atmospheric growth _CO2 . This is referred to as the global carbon budget; estimated cumulative amount of global carbon dioxide emissions estimated to limit global surface temperature to a given level above the reference period , taking into account the contributions of others of greenhouse gases to the total surface temperatureand climate forces; apportioning the carbon budget defined in the point to the regional, national or sub-national level based on considerations of equity, cost or efficiency.

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