Pop Quiz: Threats to the Great LakesThe Great Lakes face many obstacles and threats, from invasive species to clean water affordability. Put your knowledge to the test! Massive, bright green harmful algal blooms cover large parts of Lake Erie each summer. What is the primary cause of the algae?When plastic pollution breaks down in the Great Lakes, microscopic pieces of plastic are found in the lakes and even treated drinking water. How many pounds of plastic end up in the Great Lakes each year?How close have adult invasive carp been found to Lake Michigan?Tens of billions of gallons of raw sewage mixed with stormwater end up in the Great Lakes each year. This leads to closed beaches, lost revenue, and even health problems for people who come in contact with contaminated water. What’s the main cause of sewer overflows? The American Society of Civil Engineers graded America’s drinking water systems a D, noting that most of the country’s pipes are reaching the end of their useful life. What problem is caused by aged and failing pipes? Our country’s drinking water infrastructure is aging and failing, leading to contamination, water shut-offs and increased water bills. How much will it cost to replace the drinking water infrastructure in the U.S.?Each summer Green Bay experiences a “dead zone.” What does that mean?Nice job!As you can see, the Great Lakes are up against some big problems. Learn how you can help in our “get involved” page.Way to go!As you can see, the Great Lakes are up against some big problems. Learn how you can help in our “get involved” page.