“Climate Change: The Perfect Problem,” a free public program, will be presented on Wednesday, April 5, 2023, at 5:30 pm at the La Grua Center in Stonington Borough. Hosted by the Stonington Garden Club, the program will feature Dr. Matthew Kotchen, professor of economics at Yale University, who will focus on why climate change is a particularly challenging problem and offer realistic solutions. Kotchen will present an economic perspective, drawing on his experience as an academic at Yale University and a negotiator representing the United States in international environmental agreements.