毁林开荒，由于经济活动的目的，人为地砍伐自然森林，破坏自然环境，进行其它经营操作的行为。对森林的过度采伐，乱砍滥伐将导致自然生态环境恶化、破坏生态平衡。
毁林开荒也许会使毁林者变富，但从长远来看，这种做法会从整体上使地球枯竭。
Clearing forests may enrich those who are doing it, but over the long run it impoverishes the planet as a whole.
北洛河流域人类活动对河流泥沙影响较为突出的项目有毁林开荒、陡坡开荒、修路、开矿等。
The main human activities significantly influencing the river sediment in the Beiluo river basin are opening up wasteland on steep slopes and forest areas, road construction, mining, and so on.
有3000人住在自然保护区内，他们为了土地不惜铤而走险，他们毁林开荒种玉米和其它农作物。
Desperate for land, 3, 000 people live in the reserve, torching forest to clear plots for corn and other crops.
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