This document summarizes key points from Lester Brown's book "Plan B 3.0: Mobilizing to Save Civilization". The book outlines four overriding goals: stabilizing the climate, stabilizing population, eradicating poverty, and restoring ecosystems. It argues that we must cut carbon emissions 80% by 2020 through raising efficiency, renewable energy, and reforestation. However, it notes that we are in a race between tipping points in the environment and building sufficient political will for action. The challenges are great but the technologies exist to transition our energy system if political leadership can be mobilized.