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Transcript
An Introduction to the Scottish Carbon Metric Keith James, Environment Manager, WRAP Linda Ovens, Associate Director, Entec Kimberley Pratt Environmental Analyst, ZWS Content Introduction Background to LCAs & System Boundaries Data Sources Calculating the Metric Carbon Factors and Weightings Using the Calculator Working with Stakeholders Development of the Metric Background Scottish Carbon Metric The SCM allows decisions about end of life choices to be made based on environmental impact as well as tonnage Why do we need it? Part of the drive to reduce Climate Change impacts and work towards a more efficient economy (Scotland Climate Change Act) Stern review: “Climate change is the greatest market failure ever seen” What the Carbon Metric is NOT • A Carbon Footprint of waste streams – some life cycle stages are excluded • A comparison between all end of life scenarios – does not compare reuse or prevention … yet • Set in stone – reviewed annually and as new data becomes available Scottish Carbon Metric Published 15th March 2011 •Technical Guide •Local Authority Guide •Carbon Calculator Life Cycle Assessment and Thinking Life Cycle Assessment Decision Support Tool; Can provide a comparison between alternatives; Covers a range of environmental issues; Is specific to a certain supply chain, product, or system. Carried out in line with a standard (e.g. ISO 14040). Life Cycle Thinking Use of Life Cycle information in decision making; May be used to compare between alternatives and draw general conclusions; Can be general in scope and conclusions; Can be used in implementing the waste hierarchy. Boundaries of the Scottish Carbon Metric Data Quality Time; Geography; Technology; Complete; Representative; Consistent; Reproducible; Transparent; Precise / variance / uncertainty; Criteria Less than 5 years old; Scotland / UK / Europe; Average; Clearly defined limits; Representative of average; Fair treatment; Independent assessment possible; Data is traceable; Understand risks / issues; Data Sources Trade Associations US LandGEM Model WRATE WRAP (2010) Environmental Benefits of Recycling Calculating the Metric Factors Impact of waste management options for different waste streams Weighting Ranked materials comparing environmental impact Metric Tonnage + environmental impact (weighting) 11 Carbon Factors A summary of the carbon factors can be found on ZWS website Carbon impacts of materials based on LCA results Designed to include additional data as it becomes available 12 Carbon Metric Weightings 13 The Calculations 14 Recycling Rate (%) Tonnage V Carbon impact example 15 Calculating the Metric • Total waste arisings, arisings by composition • Recycling rate by composition Focusing on Carbon • Real LA data • Tonnage RR = 39%, Carbon RR = 28% Total arisings (t) Total recycled (t) Tonnage RR Carbon Metric RR Calculating the Metric • Increase textiles recycling to 90% • Send 90% food to Anaerobic Digestion Tonnage RR Carbon Metric RR Working with stakeholders • • • • • Local Authorities Waste Management sector Scottish Government and SEPA Commercial and Industrial sectors Construction and Demolition sector Development of the Carbon Metric • Unique and ground breaking… but still a work in progress • Areas for development include: • New materials and technologies • Better understanding of end of life choices • Improved data sources • CM Steering group • Interaction with other Metrics as they develop Thank you for listening