High levels of CO2 in the atmosphere have contributed negatively to climate change, global warming and ocean acidification. Therefore, here we provide a possible solution to help reduce these levels together with the production of CH4, a high-value chemical intended for energy purposes. The approach we utilize was invented by our group, making use of a metastable intermediate Hydrogen-bonded Metal-Organic Framework (HMOF) to synthesize, by dehydration, stable and functional phosphonate MOFs. Phosphonate MOFs are known for having challenging synthesis but enabling an exceptional variety of coordination modes, so the flexibility of HMOF hydrogen bonds allows to design particular MOF structures based on the desired properties. This promotes high tunable pores which can be designed for specific applications such as the catalytic reaction of CO2 molecules to produce CH4 (Sabatier reaction).