(10)The methodology to calculate life-cycle greenhouse gas emissions for activities in the information and communication sector should reflect the specificities of that sector, in particular the specialised work and guidance that has been provided by European Telecommunications Standards Institute (ETSI) for the operation of life-cycle assessments in the information and communication sector. It is therefore appropriate to allow for the use of the ETSI standard ES 203 199 as a methodology to accurately calculate greenhouse gas emissions for that sector.