Canada has appealed against the World Trade Organisation ruling that had rejected its claim that a French ban on the use of white asbestos broke global trade laws, writes Keith Nuthall. Ottawa is claiming that a WTO disputes panel incorrectly interpreted the Agreement on Technical Barriers to Trade. Since 1997, the French government has banned the production, sale, import and use of white asbestos. It had already banned blue asbestos. The case could clear the way for a European Union-wide ban.