Why is wool more sustainable than polymers J and K for making firefighter uniforms?

Sustainability refers to the ability to meet current needs without compromising the ability of future generations to meet their own. - **Wool** is obtained from sheep. Sheep can be bred and raised on farms, and they regrow their fleece each year. This makes wool a **renewable resource**. - **Polymers J and K** are made from crude oil. Crude oil is a fossil fuel that was formed over millions of years from the remains of ancient organisms. It is being used up much faster than it is being formed, making it a **finite** or **non-renewable resource**. Therefore, wool is more sustainable because its source can be replenished, whereas the source for the polymers will eventually run out.