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Tropical forests are decreasing at the rate of 16.9 million hectares per year due mainly to clearing for agriculture and shifting cultivation. Moreover, timber harvesting results in more than 5 million hectares of tropical forest becoming secondary forests every year. CIFOR has a mission to contribute to the sustained well-being of people in developing countries, through collaborative strategic and applied research. CIFOR’s research on ‘Rehabilitation of Degraded Tropical Forest Ecosystems’ projects started in 1996. Seven institutions, including UNMUL-Indonesia, FCFUM-Argentina, PNGFRI-Papua New Guinea, INIA-Peru, UPM-Malaysia, KUFF-Thailand, and EMBRAPA-Brazil are collaborating in research on: (i) evaluation of forest harvesting impacts on the forest ecosystems, (ii) development of methods to rehabilitate logged-over forests and degraded forest lands, and (iii) development of silvicultural techniques on degraded forest lands.