2021-09-30-IRENA-A_Pathway_to_Decarbonise_the_Shipping_Sector_by_2050_118页_10mb

Analysis of "A Pathway to Decarbonise the Shipping Sector by 2050"

Key Findings and Recommendations:

1. Emissions and Energy Demand:

   • Global shipping emissions are significant, contributing ≈3% of global CO₂. The sector is projected to grow, necessitating decarbonization.
   • Energy demand is driven by trade, GDP, and manufacturing. Energy efficiency (EE) measures are critical but insufficient alone, requiring a shift to renewable fuels.

2. Technology Readiness of Fuels:

   • Biofuels: Short-term viability; advanced biofuels (e.g., waste-derived HVO) are ready, though scalability challenges exist.
   • Renewable Gaseous Fuels: High readiness for biomethane/LNG blends; limited scalability for shipping due to logistical issues.
   • Green Hydrogen: High potential for future use, but technology (electrolysis) costs are high; better suited for powerfuels (e.g., ammonia/methanol).
   • Ammonia: Most promising for deep decarbonization due to high energy density, existing infrastructure, and scalability. Ready by 2023 with engine development.

3. Decarbonization Pathway (1.5°C Scenario):

   • Fuel Mix: 70% renewable fuels by 2050, including ammonia (43%), methanol (17%), and direct hydrogen (10%).
   • Key Measures: Indirect electrification (powerfuels), advanced biofuels, EE improvements, and reduced sectoral demand.
   • Emission Reduction: 80% reduction in CO₂ by 2050, enabling 144 Mt CO₂ avoidance compared to baseline scenarios.

4. Enabling Actions:

   • Policy: Implement carbon levies, tighten EE mandates (e.g., EEXI, CII), and promote sustainability certifications.
   • R&D: Accelerate engine tech (ammonia ICEs), optimize renewable powerfuels production, and integrate circular economy principles.
   • Infrastructure: Invest in bunkering hubs (e.g., ammonia, hydrogen), shore power (cold ironing), and renewable energy resources.
   • Finance: Support fuel-neutral vessel financing and renewable fuel production at scale.

Long-Term Vision:
Achieve net-zero emissions by 2050 through a synergistic blend of EE, renewable fuels, policy interventions, and infrastructure investment, aligned with global climate goals.