The Sustainable Princeton Great Ideas Breakfast Series: Food and Thought continues this spring at Princeton Public Library. These sustainability-focused programs are co-sponsored by the library and Sustainable Princeton. The breakfast meetings are held at 8:30 a.m. on the last Thursday each month in the Community Room and feature a free, sustainable breakfast provided by a local eatery.

The first is March 27, when the title is “Innovative Energy Solutions.” A panel of local entrepreneurs, including Mauricio Gutierrez, chief operating officer of NRG, will discuss the clean technology journey — from the first seeds of innovation to development of full-scale enterprises in the energy sector. Inspirational and hopeful inventions being developed in Princeton will be featured.

On April 24, the topic is “Stories of Waste and Hope.” Imagine if every plastic cup you’ve ever used and tossed could be traced back to you. How big is your personal plastic mountain? A panel of local residents and business leaders will talk about what we as a community are doing to turn stories of waste into stories of hope, and how people can help.

“Water: Our Most Undervalued Resource” is the topic on May 29. While many of us take access to clean water for granted, this valuable resource is at risk. What are the red flags to watch for? What can we as residents do to conserve water and maintain the high quality we expect for the health and well-being of our families and our community? Participants will swap stories and explore solutions to Princeton water issues with local experts from The Stony Brook-Millstone Watershed Association, university research labs and more.

The library is at 65 Witherspoon Street. Visit www.princetonlibrary.org or call (609) 924-9529 for more information.