Thursday, Apr 30, 2009 at 16:00
A couple of quotes off the net .......
A CSIRO research scientist, Dr Mike O'Shea, says the green bag's only environmental credential is that it is not the single-use high-density polyethylene plastic bag still given out in most shops and supermarkets.
The green bags, which are made from non-woven polypropylene, are designed to have a relatively long life but they are not designed to break down in the compost heap, he says.
Polypropylene is a byproduct of oil refining, O'Shea says. Produced during the process is propylene gas, which, when put into a reactor, becomes propylene powder. After stabilisers are mixed with the powder, it is placed in an extruder, which produces propylene pellets, which can then be turned into a range of things including car bumper bars and food containers. If the pellets are melted, they can be made into a fibre which can then be made into bags.
Australians are being conned," says The Age newspaper. "Your environmentally friendly green bags are made of plastic - polypropylene is a fossil fuel-based plastic. The bags are also imported from China. So, plastic, non-renewable, doing nothing for our balance of payments and guess what? You're paying for the privilege. Supermarkets are laughing all the way to the bank."
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