THE COST OF AGRICULTURE

Peter Attiwill and ]ane Fewings, Scientists for Sustainability Project, School of Botany, University of Melbourne, Parkville   The Age (letter), 28/4/99



Last month the Bureau of Rural Sciences released the results of its study on land-cover changes between 1990 and 1995. It found that 1.2 million hectares of forest had been cleared for agriculture, and development. Land clearing reduced the 1990 area of Australia's native woody vegetation cover by 0.42 per cent. This clearing is a shocking indictment of Australia's concern for biodiversity conservation and reducing greenhouse gas emissions. The bureau estimates that, during the same period, 88,790 hectares of native forest were harvested for timber.

While most of the forests cleared for cropping and grazing will be lost permanently, areas harvested for timber will be regenerated.   Over recent weeks, The Age has given extensive coverage to claims of future species extinction due to current forestry practices, but timber harvesting in Australia is well regulated compared to clearing for Agriculture. National and State level forestry policies incorporate the precautionary principle and commit governments to long-term research so that any adverse impacts of current practices can be detected and redressed.

There is no record of species extinction through sound management of our native forests for timber production, but the scientific community rightly insists that we deal with uncertainty about the threat of extinction through precautionary approaches. Urgent action is required, however to save those forests that are being lost for agriculture and grazing.