( a ) Gaseous Fuelled Vehicles Hydrogen and Fuel Cell Vehicles - Subgroup Environment GRPE may wish to be informed by the Chair of the informal group on Hydrogen Fuel Cell Vehicles - Subgroup Environment ( HFCV-SGE ) about the intention to develop amendments to existing Regulations and Global Technical Regulations in a future ( see ECE/TRANS/WP.29/GRPE/62 , paras . 34 - 37 ) .