LYCOS RETRIEVER 
Deforestation: Rates
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"We've never before detected such a high deforestation rate at this time of year." In the last five months of 2007, 3,235 sq km (1,250 sq miles) of the Amazon rain forest were lost. more
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In 1994, a study by E. Moran, E. Brondizio, P. Mausel and Y. Wu, criticized the previous research as limited to monitoring rates of deforestation and falling short of addressing land-use and policy alternatives. The propose a multidisciplinary approach that encompasses biological, social and physical scientific technique to ideate policies based on locally used strategies currently in use, that are of lesser environmental consequences.
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In a recent study by Glan Green and Robert Sussman, the two men studied aerial photography and satellite imagery in order to measure the deforestation of the island of Madagascar. The study used aerial photography from 1950 together with the satellite image data from 1972 to 1973 and 1984 to 1985 in order to estimate the area of eastern rain forests of Madagascar and the rate of deforestation over this 35 year period.
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Predominately forested scenes exhibited less variance in rates of deforestation than those scenes dominated by savannas or at the interface between forest and savanna. This may be associated with greater variability in human population density and access to forest resources in the latter.
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While tropical rainforest deforestation has attracted most attention, tropical dry forests are being lost at a substantially higher rate, primarily as an outcome of slash-and-burn techniques used by shifting cultivators. Generally loss of biodiversity is highly correlated with deforestation.
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Since the 1980’s, the scientific and popular literature has published numerous, often divergent, estimates of tropical deforestation for Central Africa. This is not surprising because deforestation rates reflect the definitions used to characterize what is and is not forest, the data sets used to derive the estimates, and the methods used to summarize the data. For example, the NASA Landsat Pathfinder approach to forest change estimation uses wall-to-wall mapping over a 16 year time period, whereas FAO uses both a direct sampling approach and an indirect modeling strategy of population growth and national forest inventory data over a 10 year period.
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