People pollute ecosystems not just by changing the land (air, water, climate).
We also cause "sound pollution."
Machinery interferes with the natural distribution of frequencies animals have allocated amongst each other. (See picture.)
For example: low-flying military planes are probably interfering with the synchronization of calling spadefoot toads in Yosemite.
Here's an article by Bernie Kraus.
"The Meaning of Wild Soundscapes"
http://www.greenmuseum.org/generic_content.php?ct_id=181
Also, this site has links to some cool audio files (for audiophiles) of natural ecosystems around the world.
http://www.wildsanctuary.com/
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