Why is wool more sustainable than polymers J and K for making firefighter uniforms?
How to approach this question
1. Define "sustainable". A sustainable resource is one that can be replaced or will not run out.
2. Consider the source of wool (sheep). Is this source renewable?
3. Consider the source of polymers J and K (crude oil). Is this source renewable?
4. Compare the two sources to explain why wool is more sustainable.
Full Answer
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.
Common mistakes
✗ Simply stating wool is "natural" without explaining why that makes it sustainable.
✗ Not mentioning that crude oil is finite or non-renewable.
✗ Confusing biodegradability with sustainability of the resource itself.
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