Green building materials, also known as sustainable building materials, are designed to minimize environmental impact. They are typically made from renewable resources, have a low embodied energy, and are often recyclable at the end of their life. Here are some examples:

Bamboo: Bamboo is a rapidly renewable resource that can be used for flooring, furniture, and even structural elements. It grows much faster than traditional timber and has a high strength-to-weight ratio.

Recycled Steel: Recycled steel can be used in place of virgin steel for structural components and reduces the energy and resources needed for production.

Cork: Cork is a renewable resource that can be used for flooring and insulation. It is harvested from the bark of the cork oak tree, which regrows the bark and can be re-harvested every nine years.

Recycled Plastic: Recycled plastic can be used in a variety of construction applications, including insulation, roofing, and piping. It helps to reduce the amount of plastic waste that ends up in landfills.

Straw Bales: Straw bales can be used to create highly insulated walls that are ideal for climates with hot summers and cold winters.

Reclaimed Wood: Reclaimed or salvaged wood can be used for structural elements, flooring, and furniture. It reduces the demand for new timber, thereby helping to prevent deforestation.

Plant-Based Polyurethane Rigid Foam: This material is a high-performance insulation material that is derived from renewable plant oils. It has a high R-value and is resistant to heat, cold, and moisture.

Sheep’s Wool: Sheep's wool can be used as a natural, renewable insulation material. It is non-toxic, biodegradable, and has excellent thermal and acoustic insulation properties.

Recycled Glass: Recycled glass can be used in a variety of applications, including countertops, tiles, and insulation.

Hempcrete: Hempcrete is a bio-composite material made from the inner woody core of the hemp plant mixed with a lime-based binder. It is a sustainable and efficient insulator.

These materials not only reduce the environmental impact of construction but can also improve the energy efficiency and indoor air quality of buildings.