I think its an unanswerable question because every one has different different answer so if we prefer geeta the holy book in which god krishna says do only what you can never think what the result will.
yes
Its an important question which is asked to everyone by themselves are they are part of it.I think yes we are part of destroying the earth in many means.
we can't say so that men are more intelligent than women it depends but now a days both are same but some time women think from heart so they are not behave according to condition.