Making a difference!!!

A friend was walking down a deserted Marina Beach at sunset. As he walked along, he saw another man at a distance. As he grew nearer, he noticed that the local native kept leaning down, picking up something & throwing it into the water. Time and again he kept hurling things out into the ocean.
As my friend approached even closer, he noticed that the man was picking up starfish that had been washed up on the beach and, one at a time, he was throwing them back into the water. My puzzled friend approached the man and said, "Good Evening, friend. I was wondering what you are doing?"
"I'm throwing these starfish back into the ocean. You see, it's low tide right now and all of these starfish have been washed up onto the shore. If I don't throw them back into the sea, they'll die up here from lack of oxygen".
"I understand," my friend replied, "but there must be thousands of starfish on this beach. You can't possibly get to all of them. There are simply too many, and this is probably happening on hundreds of beaches all up and down this coast. Can't you see that you can't possibly make a difference?
"The local native smiled, bent down and picked up yet another starfish, and as he threw it back into the sea, he replied, "Made a difference to that one!!!"

P.S: Thanks to Mangal for the lovely story!!