Should we set off a second modifying phrase before a noun?

Unless, on something' is there to indicate that you would be including details there, it doesn't add anything and could be omitted, and the order seems to be the wrong way round. I should give the information about the lack of evidence from the smaller area to the larger, for comparison, e.g. 'Evidence is almost non-existent in national scale, and scant (even)in a global scale'.