Buying bottled water or soda, of 1.5 l bottles instead of the equivalent amount in 0,5 l bottles can save about 9 kg CO2 per year.

Larger bottles (1.5L) use less packaging material per unit of volume compared to smaller bottles (0.5L). This reduced packaging means lower carbon emissions from manufacturing and transportation. The annual savings of approximately 9 kg CO2 per person is a reasonable estimate based on lifecycle assessments of packaging systems.