For most of the poem, the speaker seems to be talking about an ordinary, loving mother: someone beautiful, kind, and caring, who sings softly and looks after her child. Then the twist arrives near the end. The mother is Earth, and the people who throw things at her, ignore her pain, and watch without helping are the ones damaging the planet.
The speaker feels protective, helpless, and angry. They try to defend her, but they get laughed at and pushed aside. The mood moves from tender to desperate, and finally to a challenge aimed straight at the reader: "I hope that your angry too," and the speaker admits those who won't listen "might just be you." The poem's sharpest point is that people would care far more if Earth were human. It ends with a quiet warning that we only understand what we have once it's gone.