What are the best sustainable building materials?

Using sustainable building materials can reduce a building's carbon footprint, conserve natural resources, and improve the overall health of occupants. Here are some of the best sustainable building materials:

• Bamboo: fast-growing, renewable, and can be used for flooring, cabinetry, and more.
• Reclaimed wood: repurposing old wood from structures or furniture.
• Recycled steel: made from recycled materials, strong and durable, used for framing and roofing.
• Straw bales: a natural, renewable and biodegradable material, often used for insulation.
• Rammed Earth: an ancient technique, building walls from compacted soil.
• Plant-based polyurethane rigid foam: insulation material made from soybean oil, castor oil or other plant oils.