Your facilities for both calculations, or each player's own? I seems like it should be the latter, in which case it needs clarification.
Alternately, it might be better to simply word it as "Each player loses resources equal to each of his facilities" or "...each of your facilities" depending on which is correct.
Alternately again, the card could just indicate that it reduces the opponent's resources and give the player Production x0 for the same effect.