In three semiguided inquiry lessons on population biology, students use models and simulations to examine population trends and make projections. They are guided to create and evaluate data and to use algebraic and geometric representations to examine biotic and logistic growth models as part of examining human population growth. As they recognize the relationship between population growth and resources, they explore and propose solutions for addressing complex socioscientific problems. The underlying mathematics and science concepts of these learning cycle lessons can help students understand the complexity of environmental issues and prepare them to reason in an informed manner when they encounter debates on population and environmental issues that are often voiced in political arenas.