Until now, little has been known about the climate change reductions that might be offered by reusing and retrofitting existing buildings rather than demolish-ing and replacing them with new construction. This groundbreaking study concludes that building reuse almost always offers environmental savings over demolition and new construction. Moreover, it can take between 10 and 80 years for a new, energy-efficient building to overcome, through more efficient operations, the negative climate change impacts that were created during the construction process. However, care must be taken in the selection of construc-tion materials in order to minimize environmental impacts; the benefits of reuse can be reduced or negated based on the type and quantity of materials selected for a reuse project.

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