Your choice of cladding and curtain walling material could have a big impact on CO_2 emissions, especially when you factor in transportation and other life cycle data, which will be affected by products and materials' expected life. Don't assume that the nearer the source, the lower a product or material's CO_2 emissions will be. Other factors may come into play and the best guides are EPDs and assessment data from the BRE or other trusted sources. Many cladding and curtain walling materials, for example metals, are recycled and recyclable and this will affect their environmental profile by limiting resource depletion and minimising landfill volumes. Energy used in production and also CO_2 emissions may also be lower where materials have been recycled. Certain forms of cladding construction are inherently less wasteful because work on site, particularly cutting, is kept to an absolute minimum.
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