How do I centrally configure Fog credentials using environment variables?

Question

Other questions answer how to open (and save) a Fog connection with ENV variables, or how to configure Carrierwave with ENV variables, but I want to set the Fog credentials universally and in one place.

Answer 1

Fog.credentials = {            
  :aws_access_key_id => ENV['AWS_ACCESS_KEY_ID'],
  :aws_secret_access_key => ENV['AWS_SECRET_ACCESS_KEY'],
}