s:573:"TI Sustainable agriculture education: how can agroforestry contribute? 
AU Rudebjer G P 
AB Sometime in 1999, the world population passed the six billion mark.This was roughly a doubling of 1960 figure.Catering for the needs for food,energy and services of all these people has caused an enormous pressure on the natural resources. The loss of tropical forest is perhaps the most striking effect. But the last 30 years have also seen unprecedented agricultural development: the green revolution has roughly doubled the output of main cereals like wheat,maize and rice. 
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