Used in combination with other policies, such standards can be a tool to help develop domestic capacity to produce such goods. We are convinced that the aims of upholding and ’ safeguarding an open and non-discriminatory multilateral trading system, and acting for the protection of the environment and the promotion of sustainable development can and must be mutually supportive. One policy discussed above was harmonisation of sustainability standards, or at least of methodologies. Another is liberalisation of green goods and services. The latter, however, is easier said than done, it has languished with the rest of the Doha results in the WTO context, and is proving difficult to effect at plurilateral level among like-minded countries.