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* The correct answer is 'Only 1'.
Other information:
* The World Meteorological Congress has approved a new greenhouse gas monitoring initiative to support urgent action to reduce heat-trapping gases which are fuelling temperature increase.
* Aim: To fill critical information gaps and provide an integrated, operational framework
* The framework will bring all space-based and surface-based observing systems, as well as modelling and data assimilation capabilities, under one roof.
* The decision received unanimous support from WMO’s 193 Members.
* It is envisaged that the Global Greenhouse Gas Watch will consist of four main components:
1. A comprehensive sustained, global set of surface-based and satellite-based observations of CO2, CH4 and N2O concentrations, total column amounts, partial column amounts, vertical profiles, and fluxes and of supporting meteorological, oceanic, and terrestrial variables, internationally exchanged as rapidly as possible, pending capabilities and agreements with the system operators;
2. Prior estimates of the GHG emissions based on activity data and process-based models;
3. A set of global high-resolution Earth System models representing GHG cycles;
4. Associated with the models, data assimilation systems that optimally combine the observations with model calculations to generate products of higher accuracy.