The Agenda 2030 for Sustainable Development has elevated the profile of the environmental dimension of development and how we monitor this dimension. The United Nations Environment Programme (UNEP) has implemented Phase I of the project on Enhancing Capacity for Measuring Progress towards the Environmental Dimension of the Sustainable Development Goals (SDGs). Phase I focused on the methodological development of SDG indicators under UNEP’s custodianship and the reclassification of these indicators into Tier II or Tier I. Due to the nature and complexity of some environmental indicators, further capacity building is needed to equip member states with the necessary tools and knowledge to put in place the necessary data collection systems.