How many times have many of us, myself included, ignored a sign like this during our misspent adolescent years? Now that I am older (so say the majority!) and wiser (so say a small minority!), I realise the purpose of this type of sign is to protect and conserve nature. Nowadays I pay more attention because nature conservation is a subject close to my heart. Being a diver, I am particularly interested in sustainability of the coastal and marine environment.