The world's largest ice cream manufacturer pledges to step up its move to more environmentally friendly refrigerants for its freezer.Unilever - the world's largest ice cream manufacturer - is pledging to step up its move to more environmentally friendly refrigerants for its freezer cabinets once a pilot scheme launched at next month's Olympics in Sydney Australia, is successfully completed.Currently with some two million freezers worldwide, Unilever has already started replacing them with equipment using hydrocarbon (HC) refrigerants. It plans to accelerate the programme on completion of the trials in February next year as freezers are renewed in line with the company's replacement policy. Unilever's pledge is part of its continuing worldwide environmental programme, full details of which are published today through