 A land of green fields for crop cultivation and cattle rearing limits the space available for the establishment of native wild species . <unk> , however , traditionally used for maintaining and <unk> land boundaries , act as a refuge for native wild flora . This ecosystem stretches across the countryside and acts as a network of connections to preserve remnants of the ecosystem that once covered the island . <unk> under the Common Agricultural Policy , which supported agricultural practices that preserved <unk> environments , are undergoing reforms . The Common Agricultural Policy had in the past <unk> potentially destructive agricultural practices , for example by emphasising production without placing limits on indiscriminate use of <unk> and <unk> ; but reforms have gradually <unk> subsidies from production levels and introduced environmental and other requirements . 
