DULUTH, Minn. (AP) -- Outdoor church services, kite-flying at Canal Park and trash pickup along Barker's Island are all part of a Sunday celebration honoring Lake Superior.

Lake Superior Day is an event held every year on the third Sunday in July. It is designed to honor the world's largest body of fresh water -- and remind area residents and vacationers that the lake shouldn't be taken for granted.

Despite its giant size, Lake Superior faces polluted runoff, shoreline development and invasive species.

The lake also is warming faster than on-land locations because of changing climate conditions.

Rosie Loeffler-Kemp is a Clean Water Action coordinator in Northeastern Minnesota. She says this year's theme centers on clean boats -- and avoiding the spread of invasive species.