Jason Jay of MIT opens the Geothermal Energy Networks course by framing the climate problem at a systems level before narrowing to methane. He demonstrates En-ROADS, an open-source climate simulation tool, walking through how it models the mix of global primary energy sources and tracks greenhouse gas emissions broken down by gas. The session uses the simulator to show how different levers, from fossil fuel substitution to methane capture, move projected warming outcomes, giving students a quantitative feel for which interventions matter most. Rather than treating methane as a side issue, Jay positions it as a key lever within the broader energy transition, setting up the course's later focus on geothermal networks as one concrete technology response. The talk is part of MIT's January 2025 IAP course taught with HEET and is aimed at giving an analytical, tool-based entry point into climate and energy systems thinking.