How to Calculate your Carbon foot print by switching from Using polythene bags to Ecobags
A number of people have asked us about the implications of using plastic bags on the personal carbon footprint as well as on the environment in general.
There are some comparisons between paper bags and plastic bags available which clearly show that it all depends on how many times these plastic or paper bags are being used.
Littering is probably the severest problem related to plastic bags. Nevertheless let’s now have a look at the carbon dioxide (CO2) emissions for the production and incineration of plastic bags.
The carbon footprint of plastic (LDPE or PET, polyethylene) is about 6 kg CO2 per kg of plastic.
If you know the weight of your plastic bags, you can multiply it with the number of plastic bag you are using per year. Then you can easily calculate the carbon dioxide emitted by your own usage ofpolythene plastic bags.
The production of 1 kg of polyethylene (PET or LDPE), requires the equivalent of 2 kg of oil for energy and raw material . Polyethylene PE is the most commonly used plastic for plastic bags.
Burning 1 kg of oil creates about 3 kg of carbon dioxide. In other words: Per kg of plastic, about 6 kg carbon dioxide is created during production and incineration.
A plastic bag has a weight in the range of about 8 g to 60 g depending on size and thickness.
For the further calculation, it depends on which weight for a plastic bag you actually use.
A common plastic carrying bag in our household has a weight between 25 g and 40 g. So an average of 32.5 g.
Take the above relation between kg plastics and kg of carbon dioxide, and you get about 200 g carbon dioxide for 32.5 g of plastic, which is the equivalent of the average plastic carrying bag in our household. Or in other words: For every 5 plastic bags you use, you get 1 kg of CO2.
This means that every eco bag you use instead of a polythene bag,you save 200g of CO2 emissions into the atmosphere.