As I've mentioned, on the terrestrial side, you will see, when you get a chance to read a hard copy of my presentation, some statistics specifically with reference to economic impacts on the terrestrial side. They are large.
The reason I wanted to use an aquatic example is that, to the federal government's credit, there are many federal government agencies now helping to address this overall problem. One of them is the Department of Fisheries and Oceans. Just one aquatic invader in the Great Lakes basin—sea lamprey—has cost the taxpayers of Canada and the United States over $1 billion so far since 1960. It continues to cost the taxpayers of both countries $25 million per year to successfully manage the sea lamprey at a level that still allows us to have some healthy fisheries throughout the Great Lakes.
That's just one illustration. I don't think I need to go further. Time permitting, for example, I would talk about the impacts of zebra mussels alone on the Great Lakes. For example, the scientists are referring to Lake Huron as almost a biological desert as a result of the destructive impacts of zebra mussels alone.