http://scimagine.cc/otters-homeward-bound-ecosystem/
On the Canadian side of the Detroit River, a university student took an early morning walk. He saw a furry brown creature pop its head out from under the water. What's that? An otter for the first time in more than 100 years.
Hurray for a better ecosystem! Why? Until U.S. and Canadian laws made it illegal, factories dumped oil and petroleum in the river. Pollution made the water toxic and unlivable for the otters and the entire ecosystem. Scientist John Hartig says decades of cleanup have made a big difference. When the otters come back, he says, "good news for you and me. If the Detroit River is clean for river otters, it's cleaner for us as well."
Hurray for a better ecosystem! Why? Until U.S. and Canadian laws made it illegal, factories dumped oil and petroleum in the river. Pollution made the water toxic and unlivable for the otters and the entire ecosystem. Scientist John Hartig says decades of cleanup have made a big difference. When the otters come back, he says, "good news for you and me. If the Detroit River is clean for river otters, it's cleaner for us as well."
