Livestock farming also accounts for a lot of carbon dioxide, mostly from forests being cut down for pasture, or when overgrazing and the resulting soil erosion causes a net loss of carbon from soils.

砍伐森林建牧场，以及过度放牧导致土壤中碳含量的净流失等因素都会产生大量的二氧化碳。

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The acidic water causes the erosion of the soluble rock layers beneath the surface - eventually creating cavernous spaces.

BBC: Who, What, Why: How are sinkholes formed?