Method for measuring weekly and annual emissions of a greenhouse gas generated over a determined geographical area, characterized in that it includes the following steps: - perform daily concentration measurements of said greenhouse gas in a first plurality of locations distributed on the entire terrestrial globe and save said daily concentration measurements in an observation module, - perform daily flux measurements of said greenhouse gas in a second plurality of locations distributed on the entire globe, and save the said daily flux measurements in said observation module, - perform measurements of satellite parameters, meteorological parameters, marine parameters and ecosystem parameters in a third plurality of locations distributed on the terrestrial globe and save said parameter measurements in the said observation module, - extract, by means of an extraction module, the weather forecast data from at least one data source, - perform a flux evolution modeling of the said gas on the globe by means of an exchange module modeling the natural and anthropogenic sources and sinks, - perform a weekly anthropogenic emissions modeling of said greenhouse gas by means of an ascending inventories module, said module integrating the raw data of emissions for a plurality of facilities, - perform, using said flux evolution modeling, said weekly anthropogenic emissions modeling, and said weather forecast data, an atmospheric transport modeling of the said greenhouse gas by means of a transport module, - calculate the final fluxes of said greenhouse gas, by means of a data inversion and assimilation module using said fluxes modeling performed by the exchange module, said weekly anthropogenic emissions modeling performed by the ascending inventories module, said atmospheric transport modeling performed by the transport module and said measurements saved in said observation module, - weight, by means of a weighting module, the said final fluxes so as to provide final weighted fluxes, - calculate, using said final weighted fluxes and said weekly anthropogenic emissions modeling performed by the ascending inventories module, the weekly emissions of said greenhouse gas of said geographical area, by means of a geocoding module comprising at least one geographic information system, - extrapolate, from said weekly emissions, the annual emissions of said greenhouse gas of the said geographical area. - perform daily concentration measurements of said greenhouse gas in a first plurality of locations distributed on the entire terrestrial globe and save said daily concentration measurements in an observation module, - perform daily flux measurements of said greenhouse gas in a second plurality of locations distributed on the entire globe, and save the said daily flux measurements in said observation module, - perform measurements of satellite parameters, meteorological parameters, marine parameters and ecosystem parameters in a third plurality of locations distributed on the terrestrial globe and save said parameter measurements in the said observation module, - extract, by means of an extraction module, the weather forecast data from at least one data source, - perform a flux evolution modeling of the said gas on the globe by means of an exchange module modeling the natural and anthropogenic sources and sinks, - perform a weekly anthropogenic emissions modeling of said greenhouse gas by means of an ascending inventories module, said module integrating the raw data of emissions for a plurality of facilities, - perform, using said flux evolution modeling, said weekly anthropogenic emissions modeling, and said weather forecast data, an atmospheric transport modeling of the said greenhouse gas by means of a transport module, - calculate the final fluxes of said greenhouse gas, by means of a data inversion and assimilation module using said fluxes modeling performed by the exchange module, said weekly anthropogenic emissions modeling performed by the ascending inventories module, said atmospheric transport modeling performed by the transport module and said measurements saved in said observation module, - weight, by means of a weighting module, the said final fluxes so as to provide final weighted fluxes, - calculate, using said final weighted fluxes and said weekly anthropogenic emissions modeling performed by the ascending inventories module, the weekly emissions of said greenhouse gas of said geographical area, by means of a geocoding module comprising at least one geographic information system, - extrapolate, from said weekly emissions, the annual emissions of said greenhouse gas of the said geographical area.