Recommendation ITU-T L.1400 presents the general principles on assessing the environmental impact of information and communication technologies (ICT) 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 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.