The map shows the winter oxidized nitrogen concentrations in the European coastal and open waters in 2008.
The low category refers to values within the lowest 20th percentile and the high category refers to values within the upper 20th percentile of concentrations in a regional sea
Start a composting scheme by inviting your neighbours and even your local school to compost organic waste. It is a natural fertiliser and it can increase the soil's ability to retain water and air.
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