This report, the first interim deliverable from the IE-NETs project, presents a comprehensive review of the existing international and national literature on the potential forms of negative emissions technology (NET), with a particular focus on technology options suitable for deployment in Ireland. It includes an executive summary which presents an overview and key results from the full review. ie-nets is a two-year research project, funded by the Environmental Protection Agency of Ireland (EPA) Research Programme 2014-2020 (grant number 2016-CCRPMS.36). The project is building Irish research capacity and contributing to national policy in the emerging area of Negative Emissions Technology/Carbon Dioxide Removal.