Recommendation ITU-T L.1400: Overview and general principles of methodologies for assessing the environmental impact of information and communication technologies

Recommendation ITU-T L.1400 presents the general principles on assessing the environmental impact of information and communication technologies (ICTs) and outlines the different methodologies that have been developed in the L.1400-series: • Assessment of the environmental impact of ICT goods, networks and services • Assessment of the environmental impact of ICT projects • Assessment of the environmental impact of ICT in organizations • Assessment of the environmental impact of ICT in cities • Assessment of the environmental impact of the ICT sector • Assessment on how the use of ICT solutions impacts greenhouse gas (GHG) emissions of other sectors • Decarbonization trajectories for the ICT sector • Net zero guidance for ICT organizations • Guidance on how to address the ITU's Connect 20xx targets The Recommendation describes the intended usage of each Recommendation and the connections between them. Finally, it lists ongoing work items. 

https://www.itu.int/ITU-T/recommendations/rec.aspx?rec=15182