Several companies, including Morrisons, B&Q and Trinity Mirror, have already signed up. The accreditation, which will be available globally, is offered to companies that can prove they have reduced their carbon emissions year on year.
The Week: Brand news - Green scheme launched
The Carbon Trust, a government-funded body that advises companies on carbon-emission reduction, is launching an accreditation scheme for organisations that actively reduce their carbon emissions, rather than relying on offsets.