From my collection:

Evacuation, Power, Whose Garden Was This? - Tom Paxton
The Futures Exchange, Charlesworth Bay - Judy Small
Garbage - Bill Steele
Hands Off the Old Town - Iain C. MacKintosh
I'm Going Back on the Bicycle - Tommy Sands
It's A Wonderful Day - Harvey Andrews
Leave Them A Flower - Wally Whyton
Message From Mother Earth - Frankie Armstrong
Nimby - Brian Bedford
Woodland Waltz - Jim King
Song of the Whale - Eric Bogle

Searching for @environment in the DT will give you several more.