Ecologist: Lord Stern yesterday called on Parliament to introduce a revolutionary system of 'carbon tariffs' to help save the global climate. This would take the form of an import duty on goods from countries that do not charge companies for their carbon emissions - and so remove the disadvantage faced by businesses whose prices are undercut by firms in states which do not have carbon pricing. "Over the medium term, some sort of border adjustment for differential approaches to policy on carbon in different...