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The REAP (Resources and Energy Analysis Programme) tool uses environmentally extended input-output analysis to calculate the carbon, greenhouse gas (GHG), and ecological footprints of residents across UK local authorities and regions. Unlike territorial accounting, which measures emissions where they occur, REAP allocates emissions to the consumers of products and services. The tool allows policy makers to model future scenarios by adjusting variables such as household energy demand, food consumption, and production efficiency. The 2006 data release includes a historical time series from 1992 to 2006 and introduces GHG footprints as a new indicator. The document also compares SEI's input-output methodology with the Global Footprint Network's (GFN) trade-volume and life-cycle coefficient approach, noting that while GFN estimates for the UK are typically 5% to 15% higher, the SEI approach provides more detailed supply chain analysis for manufactured goods and services.