Question

Today, we say the world is shrinking. Why ?

Answer 1

Today's world is shrinking because we have now various means of communication like newspapers/radio and television. They provide us worldwide information and thus bring the world at our door.

Answer 2

because as we do deforestation and doing pollution.
as we do deforestation the plants decreases which get carbon dioxide and release oxygen, so carbon dioxide increases and it laid to pollution and due to pollution ozone layer which is protecting us from ultraviolet rays of sun decreases