Copper is a metal that is used for many purposes. It is mined from the earth using various methods. Though the amount of copper in the Earth's crust is very large, if the mining of copper continues, it will eventually run out.
What action could be taken to help conserve the world's supply of copper?
A) find cheaper, easier methods to mine copper
B) use another metal as a substitute for copper wiring
C) a plan to collect copper that is sent to landfills and recycle it instead
D) a way to reduce the pollution connected with the processes of mining copper
