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"There's practically no infiltration capacity left in any of the catchments on the east coast," Mortlock said.

“Soya bean devastates native forests and decreases the infiltration capacity of soils,” says the indigenous campaigner Cruz.

The programme began after the 1998 Yangtze River floods, which the government blamed on loss of tree cover, although reductions in riparian buffers and soil infiltration capacity probably also had a major role.