Eco Friendly eh? Here you go then Rory:
Top of the list is definitely Earth Song by Michael Jackson.
Roll Away the Stone by Mott the Hoople
Mud, Mud, Glorious Mud
Where have all the flowers gone by Joan Baez
Blowin’ in the wind by Bob Dylan
I feel the earth move by Carole King
Space Oddity by David Bowie
House of the Rising Sun by The Animals.
To the Moon and Back by Savage Garden
Good Morning Starshine by Oliver
and as an added bonus, anything by Earth Wind and Fire.