Harnessing energy from hydrogen in controlled, thermonuclear fusion reactions represents a major step towards carbon-free energy production and sustainable development. Power exhaust in future, burning-plasma fusion devices, such as ITER, faces the challenge of having to dissipate a large fraction of non-fusion, thermal power in the edge plasma, to protect the integrity of the surrounding wall. The aim of the MoPEF project is to elucidate the role of molecules and photons in achieving highly radiative edge plasmas by updating molecular and photon physics models in state-of-the-art computational tools. Unique measurements in two of the world's largest fusion devices, the JET tokamak in the UK and the DIII-D tokamak in the USA, will be exploited to corroborate the predicted impact of molecules and photons on the edge plasma. The project will be carried out at Aalto University in collaboration with scientists from Germany, the UK and the USA.