This reminds me somewhat of the debate which raged in the 1990's over the merits of 'set aside' verses 'extensification' in the context of farmers being persuaded to leave parts of their land un-farmed, largely through financial incentives.
The CPRE (Campaign to Protect Rural England), if I remember correctly, favoured 'extensification', especially when practised adjacent to lowland rivers flowing through arable land. For example, instead of farmers typically ploughing fields right up to the edge of river banks, it was found that a substantial strip, or 'buffer' of unploughed, untended land, served as a natural filter of rainfall run-off into the river. Additionally, there was a marked reduction in the amount of bank erosion and even the concentrations of pesticide and chemical fertiliser residues entering the watercourse were also found to be reduced.
Furthermore, longer, continuous 'buffer strips' were highly effective at providing 'corridors' for all forms of wildlife, thereby enabling it to move freely and in relative safety over large distances. Of course, up until the Second World War, this system of land management would have largely happened by default.
Much of the damage that was inflicted on our rivers during the latter part of the 20th century could still be undone, if the will existed among our rulers.
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