The Starfish Poem

What is the main message of this poem?

The message relates too plastic in the ocean, if you stop using plastic you are doing the best that you can do to save sealife. This relates to the poem where the boy is trying to save as many starfish that he can. Although it may not make a massive difference it made a difference for that one starfish or that one life in the ocean. This also relates to us in the fact that sometimes we ourselves may need a little bit  of help sometimes

Give evidence for this?

We see evidence of this when the young man says "It made a difference for that one" or when he says "Throwing starfish in the ocean".