At the FERDI-IDDRI conference on “Development, Climate and Security” held in Paris on January 15, 2018, Barbara Buchner from the Climate Policy Initiative reported on the state of global climate finance flows for mitigation and adaptation. She made two points. First, finance is under-invested to combat climate change if the COP21 target in temperature increase is to be met. Second, private investment’s role in complementing public investment in climate finance is large, with an estimated 2/3 private for 1/3 public in current total contributions. This stresses the fundamental part private investment can play in meeting the COP21 objectives, particularly at a time when governments face multiple demands on public expenditures.