The ISO-14064 Standard has been approved as "good practice" in the industry. It provides a framework for the verification of GHG inventories and projects, which gives more credibility to the GHG-reduction process.
An organisation which uses ISO 14064 standard gives you the assurance on validation/verification methods. In addition, as it is an international standard, verification done in any any country is recognized elsewhere, in USA, in Europe, at corporate level for overseas multinational headquarters as well as voluntary GHG reduction schemes.