This ITT, entitled ‘Provision of near-real-time satellite retrievals of CO2 and CH4’, is for providing support for the production of the Global Production System of CAMS operated at ECMWF, which delivers 3D distributions of greenhouse gases (CO2 and CH4) in the troposphere and stratosphere through the provision of timely satellite observations of CO2 and CH4. The Successful Tenderer shall provide timely CO2 and CH4 retrieval products from the Greenhouse gases Observing SATellite (GOSAT) and GOSAT-2 satellites as well as CO2 and CH4 retrieval products from the Infrared Atmospheric Sounding Interferometer (IASI) instrument onboard the Metop satellite platforms. The ITT targets organisations with considerable experience in the field of greenhouse gas satellite retrievals.