It traps energy from escaping into space!
I understand this question to mean "local diversity of human culture" (and not, for example, local biological diversity).
Local diversity can mean for example different food - different areas have their own food specialties).
It can also mean the customs and religions - for example how people eat (fork, chopstics, hands, etc).
Another example is the clothing, for example in India many women wear Saris, while in Europe women wear skirts or trousers.
About 3000years ago the bronze age was replaced by the iron age.
Iron.
Hope it helps
