There is increasing recognition of the severity of the environmental problems we face today, brought on mainly by excessive clearing of native forests in order to grow food for a burgeoning world population. With 25% of land cleared for agriculture now degraded to the extent that it is no longer productive, and 70% of the world’s land mass either arid or semi-arid, we have no option but to develop ways to grow food and forest products in the more challenging, lower-rainfall regions. One simple but most effective way is to plant more trees.

This has long been recognised by a few forward-thinking ...


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