deforestation
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Without doubt, humans affect the ecosystems that they come in contact with. I describe one instance, negative or positive, in which humans have affected the ecosystems.
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With these sorts of questions you are often best using local examples. I'm in the UK and I'm assuming you are somewhere in North America, so I'll try to give a global example- please adapt appropriately for your answer.
It's often quite easy to think of examples where human activities have had a negative effect on ecosystems. To be honest currently the impact of human activities on ecosystems is overwhelming.
An example of a major effect is deforestation. Eg in the Amazon rainforest.
For thousands of years humans have cut down trees and used the land for agriculture. It is now estimated ...
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