Last I heard the number was around 2% of all CO₂ emissions. The number I heard most recently was 3% and growing, but generally, I think I agree with you. It is

Last I heard the number was around 2% of all CO₂ emissions. The number I heard most recently was 3% and growing, but generally, I think I agree with you. It is something we will have to tackle, but there is higher priority, relatively low hanging fruit that will have a much bigger impact.