1) When keeping warm people could burn right amount of coal to last them for a day. They could save coals by burning when it's too cold and they absolutely need it. Trees could be save by being chopped down and processed into coal.
2) Humans need meat to live, they could hunt the bigger ones and spare the babies. In this way the babies grew up and humans could have meat next time.
3) Humans need shelters, building a house means chopping down woods. If people chopped down enough woods to build a house, it could make the environment clean by leaving some trees behind.
No comments:
Post a Comment