This song was chosen because the lyrics pretty much say it all.

Song: Marvin Gaye- “Mercy, Mercy, Me (The Ecology)”
From the Album: What’s Going On

Soul legend Marvin Gaye released the now classic album What’s Going On in 1971, featuring the song “Mercy, Mercy, Me (The Ecology). According to Earl Van Dyke of Motown’s house band the Funk Brothers, Berry Gordy did not know what the word “ecology” meant when he first heard “Mercy Mercy Me (The Ecology)”. On What’s Going On Gaye highlights man-made damage to the planet and addresses it as part of what’s going on.

In case you’re wondering here’s the exact definition of ecology:

ecology |iˈkäləjē|
noun
1 the branch of biology that deals with the relations of organisms to one another and to their physical surroundings.
• (also human ecology) the study of the interaction of people with their environment. -New Oxford American Dictionary

Based on the definition it seems like a holistic view of the environment is appropriate and it shouldn’t be viewed separately from anything else going on the world.