This essay is referring to pollution, war, epidemics that could wipe us all
Okay, Akram, I understand these things that can wipe us out, but what has it got to do with moral degradation?
You have to write about those things that could wipe out humanity OR moral degradation, but if you want to write about both I suppose it had to be from a religious point of view. For example, in some religions homosexuality is associated with moral degradation and elaborate stories are told to explain the existence of human life.
But now... you want to write that the ability of humans to survive is hindered more than ever now in the 21st century? I think that is probably true, mostly because of nuclear weapons. How about searching your school library database for articles about nuclear weapons and other "weapons of mass destruction"... I think that will get you started! :-)