Coordinated mobilisation of public and private investment in greenhouse gas removal (GGR) technologies is key to developing the GGR capacity required for the UK to achieve its 2050 net-zero greenhouse gas emissions target. It is also vital to meeting the interim targets for engineered removals of 21.3 MtCO₂ by 2040 (CCC, 2025). However, current GGR market conditions are not yet conducive to attracting private capital into GGR deployment. Technological uncertainty, revenue uncertainty and the presence of an unstable market-led environment limit investor confidence and hinder the establishment of a GGR market. The policy interventions being developed by the UK government – namely the integration of GGR into the UK Emissions Trading Scheme (UK ETS) and the introduction of carbon contracts for difference (CCfDs) – are welcome. However, based on our analysis, they are insufficient to kick-start and support GGR deployment at the necessary scale and pace. New groups of policies which strategically reduce GGR investment risk and create a more stable environment are required. This policy brief assesses and outlines public-private collaborations (PPCs) as an important intervention to unlock private-sector investment as part of a wider GGR policy ecosystem.