Wool is a natural fiber produced by sheep. It is sustainable because it is water and fire resistant, regulates temperature, and can be reused or recycled. Wool production impacts the environment through land use and emissions, but farmers take steps to reduce this, such as using appropriate fertilizers, retaining native plants and trees, and improving waste management. Climate change also presents challenges for wool production. Overall, wool is a renewable and biodegradable resource that has thermal regulating properties beneficial for consumers.