Finally, we close by noting that although this analysis is based upon the best available life-cycle data,
uncertainties exist in the final emission factors. It is important that we continue to assess the assumptions and data
used to develop these emission factors. To the extent possible, EPA will attempt to reflect changes in the
manufacturing processes, recycling processes, and disposal practices in subsequent versions of these emission
factors. In addition, it should be noted that these results are designed to represent national average data. The actual
GHG impacts of source reducing or recycling clay bricks and concrete, respectively, will vary depending on
individual circumstances (e.g., transportation of waste concrete to construction site).
Finally, we close by noting that although this analysis is based upon the best available life-cycle data,uncertainties exist in the final emission factors. It is important that we continue to assess the assumptions and dataused to develop these emission factors. To the extent possible, EPA will attempt to reflect changes in themanufacturing processes, recycling processes, and disposal practices in subsequent versions of these emissionfactors. In addition, it should be noted that these results are designed to represent national average data. The actualGHG impacts of source reducing or recycling clay bricks and concrete, respectively, will vary depending onindividual circumstances (e.g., transportation of waste concrete to construction site).
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