Biofuels carbon footprints: Whole-systems optimisation for GHG emissions reduction

Area of Science:

• Biotechnology and Bioengineering
• Environmental Science and Management
• Industrial Ecology

Background:

• Current models for ethanol production systems are often descriptive, lacking guidance for optimal practices.
• Assessing economic and environmental sustainability requires integrated approaches.
• Decision-making for farming and processing practices needs strategic design tools.

Purpose of the Study:

• To develop a normative modelling approach for strategic design of ethanol production systems.
• To combine lifecycle analysis (LCA) and supply chain optimisation (SCO) for economic and environmental assessment.
• To guide decision-makers towards optimal farming and processing practices for sustainability.

Main Methods:

• Development of a "normative" model integrating LCA and SCO.
• Geographically specific design process considering economic and environmental criteria.
• Optimisation of the nitrogen balance throughout the entire supply chain.

Main Results:

• The proposed model guides actions towards optimal outcomes, unlike descriptive models.
• Strategic crop management, viewed from a whole systems perspective, significantly mitigates global warming.
• The approach is effective even for first-generation ethanol production technologies.

Conclusions:

• Integrated LCA and SCO modelling provides a powerful framework for sustainable ethanol production.
• Normative models are essential for steering strategic policies and optimising resource use.
• A systems-level perspective on crop management is crucial for environmental benefits, particularly in reducing global warming impacts.