Oil-stained hand directly invites people to decide on which side they are : too lazy and uninterested, or ready for action now!  Silhouette of polar bear, in the middle of the hand print, warns at the consequences of their passivity.
Video is idea for the site ... each collected signature cleans dirty  hands little by little, and in the end, when enough signatures are collected, heart would appear  as a sign of  gratitude.