Even a quick google will show you that. Here's a search to try: "Frank Herbert's Dune environmentalism." Plenty of results to look through buddy, and none of them from me, or anyone else on this site I'd bet.

{copy/pasted from the Wikipedia article}
Environmentalism and ecology

Dune has been called the "first planetary ecology novel on a grand scale."[12] After the publication of Silent Spring by Rachel Carson in 1962, science fiction writers began treating the subject of ecological change and its consequences. Dune responded in 1965 with its complex descriptions of Arrakis life, from giant sandworms (for whom water is deadly) to smaller, mouse-like life forms adapted to live with limited water. The inhabitants of the planet, the Fremen, must compromise with the ecosystem they live in, sacrificing some of their desire for a water-laden planet in order to preserve the sandworms which are so important to their culture. Dune was followed in its creation of complex and unique ecologies by other science fiction books such as A Door into Ocean (1986) and Red Mars (1992).[12] Environmentalists have pointed out that Dune's popularity as a novel depicting a planet as a complex—almost living—thing, in combination with the first images of earth from space being published in the same time period, strongly influenced environmental movements such as the establishment of the international Earth Day.[13]

{Citation 12} ^ a b James, Edward and Farah Mendlesohn. The Cambridge Companion to Science Fiction. Cambridge: Cambridge University Press, 2003. pp. 183-184. ISBN 0521016576

{Citation 13} # ^ France, Edited. Facilitating Watershed Management. Lanham: Rowman & Littlefied Publishers, 2005. p. 105 ISBN 0742533646