One picture worth 10,000 words--Chinese saying.

Before NASA gave us pictures of Planet Earth, we could only see parts of the Great Lakes. Now we can see how all five freshwater lakes are connected and how they empty into the Atlantic through the St. Lawrence River.

I kept this in mind as I wrote The Dynamic Great Lakes. The book's focus is on ecosystems.

I wrote the book because these lakes are an important part of the planet's water system. The book is widely available online and has been critically acclaimed.