The document discusses the emerging sustainability certification systems for bioenergy, emphasizing the need for proper regulations to address criticisms surrounding the sustainability of biofuels and solid biomass. It highlights ongoing initiatives and policies, especially within the EU and the US, aimed at establishing criteria for sustainable biomass production, while noting the challenges of harmonization and market confusion due to differing standards. The document concludes with recommendations for further action towards unification and better governance in biomass sustainability efforts.