In Denmark, all new and rebuilt supermarkets use CO2 for their refrigeration systems instead of synthetic refrigerants. This typically reduces their CO2 emissions by 30%. Danfoss has supplied the components for use in most of these CO2 refrigeration systems – most recently for the biggest of its kind in the world, which Danish Supermarkets’ discount retail chain, Netto, began using in January 2010. The related national legislation is key factor in ensuring that Denmark is at the forefront when it comes to CO2 refrigeration systems.