What changes took place in people’s lives when they started recycling metal?

For the first time, people were able to learn how to process metal in the period from 7 to 4 thousand BC. At first, people mastered tin and copper. The mastery of metal processing allowed people to make various tools and implements of labor, which, in turn, made it possible to improve agriculture and develop crafts. After a certain period of time, people learned to smelt bronze, and after several millennia, iron.