Recycling of waste plastic and production of CO2-neutral fuels are two critical contemporary environmental challenges. Currently, recycling is suboptimally implemented with an estimated global recycling rate of only 9% and less than 1% of plastics being recycled more than once. Hydrogen, often considered as the frontrunning energy vector to replace carbonrich fossil fuels , is most commonly produced using 'grey' (CO2-releasing) methods, accounting for almost the entirety of global production and releasing ~900 MtCO 2 in 2020. Photoreforming (PR) offers a potential pathway to circular carbon use and clean production of hydrogen through the coupled oxidation of waste substrates and reduction of protons to hydrogen gas powered by sunlight. The oxidation half reaction is potentially applicable for the valorisation of diverse waste streams, including plastics and biomass, to useful materials, while the reduction half reaction offers a 'green' alternative to 'grey' hydrogen. In this way, PR can help mitigate plastic waste and contribute to an energy transition to H2 fuel.