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more stable environment. On the other hand, a single large reserve is subject to devastation by a single catastrophic event like a fire, flood, or disease. Breaking the reserve into separate pieces reduces the risk of complete population loss by a single event, but diminishes the size of the species populations and puts them at a higher risk of extinction. In addition, if the reserve is too small it may experience system decay resulting in the loss of many species. Small reserves are particularly affected by the invasion of alien species. Studies have shown that domestic mammals will venture up to three miles into the rainforest, not only introducing disease and alien plant seeds, but also eating eggs, destroying nests, and crushing seedlings. Finally many species require a certain threshold-population size or range to persist. Besides species surveys, accurate and objective assays are needed to assess the various environmental conditions pertaining to the rainforest. Annual forest cover, deforestation rates, climate change, siltation, urban growth and encroaching development, erosion, pollution, and other trends need be recorded to establish baselines to properly assess the situation. The good news is there are a number of government and private sector Earth observation programs. The best known of these is Landsat, which is run by NASA. Google has helped popularize Landsat images by making them easily accessible via Google Earth. The restoration of entire ecosystems is most possible in regions where parts or at least remnants of the original forest still remain and there are few human population pressures. Small clearings surrounded by forest recover quickly and large sections may recover in time, especially if we provide some assistance in the reforestation process. After several years, a once-barren field can again support vegetation in the form of pioneer species and secondary growth. Although the secondary forest will be low in diversity and poorly developed, the forest cover will be adequate for some species to return . In addition, the newly forested patch can be used for the sustainable harvest of forest products and low-intensity logging. Admittedly, there are many challenges facing sustainable use of tropical rainforests. In arriving at a solution many issues must be addressed, including the resolution of conflicting claims to land considered to be in the public domain; barriers to markets; the assurance of sustainable development without over-exploitation in the face of growing demand for forest products; determination of the best way to use forests; and the consideration of many other factors. Increasing the transparency of business transactions and standardizing the procedures of awarding concessions will also improve forest management. By stimulating open competition through auctions, questionable concessions granted through nepotism or corruption can be reduced. Instead of bribes, concessions could be granted to bidder who make the best offers,

mcdonnell douglas av 8b harrier ii all over printed hawaiian shirt 1
mcdonnell douglas av 8b harrier ii all over printed hawaiian shirt 1

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