Mitigation Scenario 2B: 20% Energy Efficiency (EE) – Firewood and Charcoal. Mitigation Scenario 3: 5% Biofuel Use in Transport. Mitigation Scenario 4: Waste Sector (Landfill Gas). Mitigation Summary. Scope and Coverage. The GHGs of concern are mainly Methane (CH4), Carbon dioxide (CO2) and Nitrous oxide (N2O). The sectors covered are energy, transport and waste. Assumptions and Methodological Approaches.