There is a lot of “green” marketing about at present because “green” has become the flavour of the month and in Australia the regulators have launched a campaign against what they call “greenwash”. You must be able to prove all green claims you make or be liable for large fines.
The international Standards organisation has 2 ways of certifying green. One is with ISO 14001 which is about the behaviour and practices of a business and its employees and contractors and the other is ISO 14020 which certifies product.