The ability of the International Organisation for Standardisation (ISO) to create a much needed global standard for biofuels has been questioned by an alliance of the European Union (EU), the USA and Brazil.
At stake is the chemical definition of biodiesel, bioethanol and other fuels, easing their trade and marketing worldwide.
There is no standard at present, but the US, the EU and Brazil are drafting one, releasing detailed proposals in a white paper.
Controversially, it attacked the ISO saying its procedure for international standards is inconclusive and cannot be relied on.
The potential clash comes during disagreements at the EU Council of Ministers over whether sustainability guidelines regarding biofuel production should be written into a proposed new EU fuel quality directive.
ISO specialists have long urged the creation of an ISO biofuel sub-committee charged with drafting a standard and a decision on creating one could come this week.