I think that this poem is about an old man in a wheelchair (“Wheel me down to the shore”), who feels that he is about to die. Dying is humanly, it is the normal cycle of life; therefore you can actually feel that it is a poem about you, about humankind.
The relationship between people and nature is very well emphasized throughout the poem. An example could be the simile “and see the stars flaring out, one by one, / like the forgotten faces of