NATURE OR HUMANS- who do you think will be responsible for the world's end?

if ever the world end will happen.the culprit would be both nature and humans will be responsible for the worlds end.nature because as we know it the world is already old and aging and people who lives in it contributed much faster to its destruction by polluting the environment.and we as people should do something to avoid this thing to happen by lessening the things that might affect the destruction of nature.its not too late to start doing it.