The song here is a condemnation of humanity's recklessness towards the environment, their ignorance, complacency, and pollution, leading to the destruction of the world and its natural systems. An elegy itself is a poem of serious reflection, typically a lament for the dead. Here, the use of elegy implies that it is too late to save the earth from what's been lost; This is Earth's elegy.
The song here is a condemnation of humanity's recklessness towards the environment, their ignorance, complacency, and pollution, leading to the destruction of the world and its natural systems. An elegy itself is a poem of serious reflection, typically a lament for the dead. Here, the use of elegy implies that it is too late to save the earth from what's been lost; This is Earth's elegy.