Increases the amount of Shields produced in Swamp Terrain from 0 to 4
Some bogs and swamps contain a brown organic material known as peat. Peat is made up of partially-decomposed plant matter, and has a high carbon content. Although dried peat is sometimes compressed and burned as fuel, the most valuable use for peat is as a fertilizer and mulch for farming and gardening. The high mineral content and its ability to retain moisture make peat well-suited to this purpose.
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