Question

land is decreasing under permanent pastures​

Answer 1

permanent pastures lead to soil erosion and aslo create the soil infertile.

that's why land is decreasing.

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Answer 2

Answer:

Land under permanent pasture is decreasing because, due to increase of population in an uncontrollable rate, demand for food, land for houses etc. ... So, people start using the pastural ground for making their house or using it as an agricultural land.