"Another Green World" made up part of a broader movement known as progressive electronic, though the album itself is a little more rock-oriented in the sense that it often features vocals and traditional instruments (guitar, bass, etc).

Nevertheless, if you like the electronic/ambient aspects of this work, here are some quick recommendations:

Hans Joachim Roedelius - Wenn Der Südwind Weht

Harmonia - Musik Von Harmonia

Cluster - Zuckerzeit

Klaus Schulze - Timewind

Edgar Froese - Epsilon in Malaysian Pale

Richard Pinhas - Iceland

K. Leimer - Closed System Potentials

Steve Roach - Structures from Silence

Michael Stearns - M'Ocean