Posted by Sarah on Thursday, February 14, 2013 at 6:27pm.
We've mowed down the tall grass and cut a lot of trees to plant food crops. We've disturbed habitats by building homes and business buildings. We've paved over good land for roads and parking lots. We've spewed pollutants in the air, killing some vegetation and animals.
Here's a lot more information.
http://www.ehow.com/facts_5479886_effects-human-activities-ecosystem.html
http://www.livestrong.com/article/272608-the-impact-of-human-activity-on-the-ecosystem/
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