So I did have time by the end of the day ...
Here's most of the song for a starter ... may jog someone else's memory. The words in brackets are replacements for words I didn't "catch" from the recording.
The tune sounds hymnlike.

THE DAM SONG
R Woods and _ Simpson

They built a dam across our river till the valley disappeared
Now our village is a log-land tight against the concrete weir.
All the animals they are drown-ed and the trees are long gone under
But we've got a televisi-on powered by the water's thunder.

And it teaches us to care about the earth, to care about the earth, oh - care about the earth
It teaches us to care about the earth, but what does it matter,
What does it matter when we've got no earth to see?

We worked hard to build our bungalow and the architect agreed,
It should have a picture window but there's nothing left to see
Except for all the other bungalows and the [tiny lawns]
But we've go a picture on the wall of the old house we tore down.

And they teach their children to care about the earth, to care about the earth, oh - care about the earth
They teach their children to care about the earth, but what does it matter,
What does it matter when we've got no earth to see?

We drive high into the mountains where the lonely crops decay
And we wonder and we marvel at the beauty of the day
When sturdy families worked the meadows all around the stoney glen
And nature gave them many [bounties] but now, like the crops, it's near its end.

So we sit here in the car and we care about the earth, we care about the earth, care about the earth,
We sit here in the car and we care about the earth, but what does it matter,
What does it matter when we've got no earth to see?