4. “Conserve Building Materials, Reduce Construction Waste, and Sensibly Use Natural Resources.” Recycling old materials, using products like bamboo which has a short regeneration time, and focusing on attaining materials from nearby all contribute to the conservation of natural resources. 5. “Protect and Enhance Indoor Environmental Quality.” Monitoring levels of carbon dioxide as well as maintaining adequate air ventilation contribute to this environmental quality. It is also important to stray from using toxics that create a “new-building smell,” as well as to focus on aesthetics such as adequate daylight and views of the outdoors.