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To cnservation of forest we should grow more trees.Though covering only 13.4 per cent of the Earth's land surface, these forests contain half of all vertebrates, 60 per cent of all known plant species, and possibly 90 per cent of the world's total species. However, recent studies have shown that temperate and boreal forests with their extremely varied ecosystems, especially those in climatic and geographical areas where old-growth forests still occur, may be even more diverse than tropical forests in terms of variation within some species. Eventhough temperate and boreal forests generally have far fewer tree species than tropical forests, often having a tenth or less in total, certain temperate and boreal forests are now thought to be as diverse, or even more diverse, than their tropical counterparts. For example, old-growth forests in Oregon, U.S.A. are found to have arthropods in leaf litter approaching 250 different species per square meter; with 90 genera being found in the H.J. Andrews Memorial Forest research area alone (Lattin, 1990). It has been suggested that a network of 500 protected and managed areas, with an average size of 200,000 hectares, covering 10 per cent of the remaining old-growth/primary forests be the minimum acceptable target
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