All at Sea

(Note - words that meet the prompt criteria have been bolded. Thanks.)

The Doctor sat, his toes in the water
Looking out over the sea
The rain plish-plashed, the beach was empty
All alone was he.

"There may be a storm," they had warned
But he felt one with nature
"I'll be safe, I'll be happy in solitude
I think I shall just stay here."

He watched the horizon as the sky darkened
And the drops began to fall
The waves grew louder, stronger, higher
The seagulls ceased to call.

Then suddenly, he saw it
And his eyes opened wide
What was that, what was that
Floating in with the tide?

Surely – surely – a turtle shell?
Such a big one, giant size?
It was, it was! He could see the flippers
The neck, the head, the beautiful eyes.

He stared as the animal lumbered
To stop inches from where he sat
And then – oh my goodness –
It said, "Doctor, I want to chat!"

A turtle, speaking human? Addressing him?
"What, what?" he stuttered
"Glad to get you alone,"
Was what the turtle muttered.

"You see, it's like this. Humans pollute
and while we don't want to fuss,
all the plastic bags and oil spills
are harmful to us.

"As a Doctor, advise them do
That this ruins their own health
The Earth's resources are to be used
But you're abusing this wealth."

Now, the Doctor has a sign
The patients ponder it as they wait
"The environment is our source of health
Let us strive to keep it great."