Based on other ITU-T L.14xx-series of Recommendations@ this Recommendation aims at providing guidance for the assessment of ICT-related greenhouse gas (GHG) emissions and energy consumption at city level. This Recommendation provides a framework for the quantitative assessment at city level of first and second order effects of ICT. It also gives some guidance on how to qualitatively assess other effects. More specifically@ this Recommendation can be used to assess the first order effects of the use of ICT in organizations and households@ as well as its first and second order effects when applied to different industrial sectors such as transport@ buildings@ utilities and waste management. For the second order effects@ it is not expected that the overall second order effects of all ICT at city level is assessed. Rather@ this Recommendation provides guidance on how to assess the second order impact of one or more ICT projects or ICT services at the scale of the city. This Recommendation@ in line with [ITU-T L.1400]@ is focused on energy consumption and GHG emissions. This Recommendation is intended for city authorities@ policy-makers@ environment and ICT experts and the industry and planning authorities@ and can be used to guide the assessment of ICT-related GHG emissions and energy consumption at a city level.