The zebra mussel: Twenty years later

It was an invasion predicted 95 years before it arrived. Research reports, dating back to 1893 and including a 1981 report to Environment Canada, warned of the risk the zebra mussel posed to the Great Lakes. Despite the warnings, Canada and the United States failed to act. And today, twenty years after the mussel’s discovery, both countries still lack the regulations that would have stopped it in the first place.