This report examines the basis of estimates for the future size of the voluntary market and makes suggestions on how these figures should be interpreted. We conclude there will be a growing demand for carbon credits from companies looking to offset emissions and that prices should and will rise, but not to the levels suggested by the TSVCM. Our research forecasts a voluntary market size of $10 – 40bn in 2030 – someway short of the TSVCM’s higher estimates of $100 – 180bn. If the voluntary carbon market is to make a material contribution to global decarbonisation efforts a sustained effort is required on a several fronts.