Model projections refer to predictions or estimates made by using a mathematical model. In the context of climate science, these are computer simulations that attempt to simulate future climate conditions based on current data and knowledge about how the Earth's atmosphere works. Modelers use various input parameters such as greenhouse gas concentrations, solar radiation levels, and other factors to generate multiple scenarios or projections of what might happen in the future if certain trends continue. These model projections are then used by scientists, policymakers, and others to make informed decisions about how best to prepare for potential impacts of climate change.