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Coniferous forests are forests consisting pines, spruce and fir trees. The question is asking factors that affect forests (in a bad way) which consist of pine trees, cone bearing shrubs, fir trees etc .

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right. For example people usually in countries like USA which celebrate christmas cut fir trees and cone trees in a large scale to sell it.
It is over exploited for decoration.
ya thnks for clearing my doubt
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