A transformation preserving preserves both parts separately. Taipei maintains an extensive system of parks, green spaces, and nature preserves. Bananas can be made into fruit preserves. Ecotourism often claims that it preserves and "enhances" local cultures. Carrots can also be used alone or blended with fruits in jams and preserves. Lactic acid fermentation also preserves food and prevents spoilage. Only the Byzantine textual tradition preserves a distinction. Traditionally in winter, jams, preserves, and pickles are brought to the table. It also preserves that which should naturally be destroyed. It is home to one of the world's largest wildlife preserves. The Electric City Trolley Museum preserves and operates pieces of Pennsylvania streetcar history. A number of other state parks, preserves, and forests are located inland. Agencies are actively trying to increase the protection for natural preserves. These bacteria ferment carbohydrates to lactic acid, which preserves the input. The burning of a natural gas alternative preserves diesel thermal efficiencies.