Many wineries have launched campaigns to reduce their carbon footprint. It is an ambitious task that expands into all areas of operation including production, agriculture and logistics. 

The choice of bottle closures can be an important factor in achieving a carbon neutral position. All published estimates show that the production of Natural Cork has a lower carbon footprint than any alternative. More importantly, if you calculate the carbon fixing effect of the cork forest, the net carbon footprint for natural cork shows that each cork acts as a carbon sink. In the carbon footprint calculator provided here - each natural cork contributes an offset of 118g of CO2. 

If you have started on a program of reducing your carbon footprint, you are 

surely aware that there are many accounting theories in play. The CQC 

model cites several examples and has selected those figures with the 

deepest documentation. Assumptions and references used for these 

calculations can be found at www.corkqc.com/sustain/carbon-notes.htm