Fourth-graders Dov Chen (center right), Ben Newton (center left), Andrew Bergin (right) and Sean Sullivan talk about projects the Ecology Club could work on. | Ryan Pagelow~Sun-Times Media

Fourth-graders (from right) Lauren Oleferchik, Lainey Quinones and Julia Cashman work on posters about recycling for the Ecology Club, which meets weekly after school at Walker School. | Ryan Pagelow~Sun-Times Media

Fourth-graders (from right) Carolyn Saban, Emily Ascher and Ellie Miller work on a newsletter for the Ecology Club. | Ryan Pagelow~Sun-Times Media

Fourth-graders Haley Letts (right) and Emily Venis work on signs of what to put into garbage bins and recycling bins. | Ryan Pagelow~Sun-Times Media

Fourth-graders Sean Sullivan (right) and Andrew Bergin talk about projects the Ecology Club could work. | Ryan Pagelow~Sun-Times Media

Fourth-graders (from left) Eric Brugge, Nathan Brooks and Quintin Craig work on posters about recycling. | Ryan Pagelow~Sun-Times Media