It's been 50 years since Canada and the U.S. signed the Great Lakes Water Quality Agreement, meant to restore and protect the Great Lakes, and a new report is showing what's changed over that time and what challenges are ahead. According the the annual report, the Great Lakes overall assessment is "fair" with an "unchanging" trend, which is due to the "tremendous progress to restore and protect the Great Lakes" over the last few decades. The evaluation is based on a set of indicators officials watch.