In this track, Eno seems to make once again a experiment based on physical or cosmological abstractions. Without the wind (air), Earth would be extremely hot, and that temperature would be stabilized all the way throughout the planet.
In other words, there would be no possibility of life.
Also, the song keeps the synths base all the time, reinforcing the idea of stable temperature.

In a more subjective sense, Brian Eno may also be referring to the wind as the changes in our lives. As David Bowie sang once in one of his masterpiece albums, in Wild is the Wind, the wind always represents a sudden change in our life, and is necessary to make us grow; though many people wonder about what life would be like without any problems; Eno seems to explore this imaginary in the song.