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Task 4: Environmental Impact Analysis for Moon Colony Construction
使用液氧甲烷(LOX/CH4)燃料的环境影响评估

分析不同建设方案对地球环境的影响，并给出最小化环境影响的模型调整策略。
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参数:
    scenario_name: 情景名称
    completion_years: 完成年限
    elevator_fraction: 电梯运输比例 (0-1)
    rocket_sites_used: 使用的火箭发射场列表
    emission_factors: 排放因子
    renewable_energy_fraction: 可再生能源占比 (0-1)
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       - Stratospheric H₂O injection: {:.1f} Mt (potential climate impact)
    
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================================================================================z1. FUEL PARAMETERS (LOX/CH4)z  Specific Impulse (Isp): z sz  Exhaust Velocity: r0
z m/sz  Specific Energy: g<00><>.Ar;
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z% of global)z    CO2 per ton payload: r<>z kg/tonz3. ENVIRONMENTAL IMPACT RANKINGz
  By Total CO2 (lowest first):rz    z. z: r<>rz 
  CO2 Reduction vs Rocket Only:z: -z04. OPTIMIZATION FOR MINIMUM ENVIRONMENTAL IMPACTz
  Optimization Constraints:z(    - Minimum completion time: 120 yearsz"    - Maximum annual CO2: 50 Mt/yrz$    - Renewable energy fraction: 50%z
  Optimal Solution:z    - Elevator fraction: r<>z    - Rocket sites used: r
z    - Completion time: r
z    - Total CO2: r<>z    - Annual CO2: z Mt/yrz#5. MODEL ADJUSTMENT RECOMMENDATIONSu|
  To minimize environmental impact, adjust the model as follows:

  A. OBJECTIVE FUNCTION MODIFICATION:
     Original: min(α×Time + β×Energy)
     Modified: min(α×Time + β×Energy + γ×CO2_total + δ×H2O_stratosphere)
     
     Where γ and δ are weights for environmental costs.

  B. RECOMMENDED STRATEGIES (by effectiveness):
     
     1. Prioritize Elevator Transport (CO2 reduction: ~70-80%)
        - Elevator has no direct combustion emissions
        - Top rocket stage emissions much smaller than full rocket launch
        
     2. Use Renewable Energy for Elevator (CO2 reduction: 5-10%)
        - Replace grid electricity with solar/wind
        - Reduces electricity-related emissions
        
     3. Low-Latitude Launch Sites Only (CO2 reduction: 3-5%)
        - Lower ΔV requirements = less fuel
        - Kourou (5.2°) vs Alaska (57.4°): ~10% fuel difference
        
     4. Green Methane Production (CO2 reduction: 15-20%)
        - Use bio-methane or synthetic methane from CO2 capture
        - Reduces fuel production emissions
        
     5. Extend Timeline (CO2 reduction: proportional)
        - More time → more elevator use → less rocket use
        - Trade-off: slower colony establishment

  C. QUANTIFIED IMPACT:
     - Baseline (Rocket Only): {:.0f} Mt CO2
     - Best Case (Elevator + 100% Renewable): {:.0f} Mt CO2
     - Maximum Reduction: {:.1f}%
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  - Stratospheric fraction: z%
  - Stratospheric H2O: z Mt
  - Residence time: z<> years
  
  Potential Climate Effects:
  - Stratospheric H2O has greenhouse effect (radiative forcing)
  - May affect ozone chemistry
  - Elevator-only scenario eliminates this impact entirely
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