The Task Team on Global Greenhouse Gas Watch Modelling (TT-G3W-Modelling) supports the implementation of G3W within WIPPS by defining mandatory and recommended products, documenting modelling systems, and specifying core and complementary functions of G3W centres. It updates the WIPPS Manual and Guide with relevant standards, develops verification protocols, supports network design experiments, and conducts compliance risk assessments for WIPPS Designated Centres. The team collaborates with TT-G3W-Networks, TT-G3W-Data, research bodies, and partners to ensure harmonized operational greenhouse gas modelling practices.