The Fremen, the indigenous people of Arrakis in "Dune," aim for the ecological transformation of the planet into a more habitable and verdant world. Their vision involves terraforming parts of Arrakis to introduce vegetation and water, while also preserving the desert for the sandworms and spice. This reflects their desire for a more comfortable life for future generations and aligns with the ecological themes in the series, highlighting the balance between human progress and environmental harmony.