Need is an interesting word to use. Though (trying to be more candid) proving -anything- is subjective and carries only personal merit. Also, 'facts' are never permanent, even in the scientific realm.
To state a 'fact,' relates to something, an idea etc., which has not yet -importantly yet- been proven wrong. I would like to say as well that scientific 'facts' do hold great importance to most everyone (don't say all -smirks-).
Back to it:
Considering (whether you like it or not) a cyclical timeline, can we create a better place for ourselves?