PORTLAND – The public is invited to attend a 1st District congressional candidates forum on “Sustainability in Maine” 3-5 p.m. Sunday, Sept. 28, in the event room on the seventh floor of the Glickman Library on the University of Southern Maine’s Portland campus.

Charlie Summers, the Republican nominee for the 1st District U.S. House seat, and Chellie Pingree, the Democratic candidate, will participate in the nonpartisan event. Irwin Gratz, host of Maine Public Radio’s “Morning Edition,” will moderate.

The forum will cover topics such as global warming, alternative transportation, clean energy, land protection, wildlife habitat, water quality, reducing toxins, and supporting Maine agriculture and fisheries. A reception will follow, with light refreshments served.

The forum will be broadcast on community television stations in more than 230 cities and towns throughout Maine during the month of October. A complete list of towns airing the forum is available at www.trails.org/forum.

The event is free, but space is limited. To reserve a seat, write to info@trails.org.