Interesting video:

In this short documentary from conservationist Bill Mason, he
illustrates that although the Great Lakes have had their ups and downs,
nothing has been harder to take than what humans have done to them
lately. In the film, a lone canoeist lives through the changes of
geological history, through Ice Age and flood, only to find himself in
the end trapped in a sea of scum.

Photo: NASA/courtesy of nasaimages.org