Can I change this '下‘ for '前面‘？ I have this in my text:

在绿色、环保已成为全社会共识的大背景下， 。。。

‘背景下’ says to me ‘under a background' which seems odd. I would rather locate things 'in front of' a background.

Can I change '背景下‘ for '背景前‘ or '背景前面‘ and still win the 'Impeccable Chinese Prize' ？？
No. The grammatical pattern is 


  在x下


which means "with x as true/under". An example would be: 


  在共产党的统治下，中国变强了。


So the sentence means something like (though it's kinda hard to translate this semi-literally without sounding very weird): 


  With a green and environmental world as the consensus background for
  society...