In reply to:

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Further enhancing the fact that the interpretation of Bowie numbers makes for great comedy

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I did not mean this to be funny. Please notice the juxtaposition of:

cactus, prairie, home, sun, branches, sky

against

mobile, city, shops, collision

Answer these questions:
Why would Bowie personify cactus?

Why would Bowie contrast an image of a cactus surveying its home in a prairie, against cacti made homeless by the construction of shops?

Truly, the theme of this poem is that materialism and technology destroys what is natural and pure. The theme is continued in Five Years, Diamond Dogs, and Young Americans