Question

how are human being responsible for the depletion of ozone layer

Answer 1

we humans are responsible for it because we use many gases which are dangerous for ozone layer and deplete it.for ex.chloro fluorocarbon (CFC)

Answer 2

Humans are responsible for the depletion of ozone layer in many ways such as ---
1-by using CFCs chloro fluro carbon
2-by the use of halogenated compounds which deplete ozone layer suck as chlorine and bromine