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NCOS is the Australian Government's "National Carbon Offset Standard".[1]
Internationally, the Gold Standard Foundation has significant support, describing itself as "A best practice methodology and a high quality carbon credit label for both Kyoto and voluntary markets".
Airlines
The Qantas group and other airlines offer carbon credits to customers booking flights online, but the percentage taking up the offer is very small.
An analysis from 2008 suggested that less than 1% of Qantas passengers paid the offset, with figures for Virgin Blue suspected to be around the same, while 12% of Jetstar passengers paid.[1]