From "Manual of Muad'Dib" by the Princess Irulan

Why does he keep repeating the obvious? Kynes wondered.
He tried to think of moisture in the air—grass covering this dune . . . open water somewhere beneath him, a long qanat flowing with water open to the sky except in text illustrations. Open water . . . irrigation water . . . it took five thousand cubic meters of water to irrigate one hectare of land per growing season, he remembered.
"Our first goal on Arrakis," his father said, "is grassland provinces. We will start with these mutated poverty grasses. When we have moisture locked in grasslands, we'll move on to start upland forests, then a few open bodies of water—small at first—and situated along lines of prevailing winds with windtrap moisture precipitators spaced in the lines to recapture what the wind steals. We must create a true sirocco—a moist wind—but we will never get away from the necessity for windtraps."
Always lecturing me , Kynes thought. Why doesn't he shut up? Can't he see I'm dying?
"You will die, too," his father said, "if you don't get off the bubble that's forming right now deep underneath you. It's there and you know it. You can smell the pre-spice gasses. You know the little makers are beginning to lose some of their water into the mass."
The thought of that water beneath him was maddening. He imagined it now—sealed off in strata of porous rock by the leathery half-plant, half-animal little makers—and the thin rupture that was pouring a cool stream of clearest, pure, liquid, soothing water into . . .
A pre-spice mass!
He inhaled, smelling the rank sweetness. The odor was much richer around him than it had been.
Kynes pushed himself to his knees, heard a bird screech, the hurried flapping of wings.
This is spice desert , he thought. There must be Fremen about even in the day sun. Surely they can see the birds and will investigate .
"Movement across the landscape is a necessity for animal life," his father said. "Nomad peoples follow the same necessity. Lines of movement adjust to physical needs for water, food, minerals. We must control this movement now, align it for our purposes."
"Shut up, old man," Kynes muttered.
"We must do a thing on Arrakis never before attempted for an entire planet," his father said. "We must use man as a constructive ecological force—inserting adapted terraform life: a plant here, an animal there, a man in that place—to transform the water cycle, to build a new kind of landscape."
"Shut up!" Kynes croaked.
"It was lines of movement that gave us the first clue to the relationship between worms and spice," his father said.
A worm , Kynes thought with a surge of hope. A maker's sure to come when this bubble bursts. But I have no hooks. How can I mount a big maker without hooks?
He could feel frustration sapping what little strength remained to him. Water so near—only a hundred meters or so beneath him; a worm sure to come, but no way to trap it on the surface and use it.
Kynes pitched forward onto the sand, returning to the shallow depression his movements had defined. He felt sand hot against his left cheek, but the sensation was remote.
"The Arrakeen environment built itself into the evolutionary pattern of native life forms," his father said. "How strange that so few people ever looked up from the spice long enough to wonder at the near-ideal nitrogen-oxygen-CO2 balance being maintained here in the absence of large areas of plant cover. The energy sphere of the planet is there to see and understand—a relentless process, but a process nonetheless. There is a gap in it? Then something occupies that gap. Science is made up of so many things that appear obvious after they are explained. I knew the little maker was there, deep in the sand, long before I ever saw it."
"Please stop lecturing me, Father," Kynes whispered.
A hawk landed on the sand near his outstretched hand. Kynes saw it fold its wings, tip its head to stare at him. He summoned the energy to croak at it. The bird hopped away two steps, but continued to stare at him.
"Men and their works have been a disease on the surface of their planets before now," his father said. "Nature tends to compensate for diseases, to remove or encapsulate them, to incorporate them into the system in her own way."
The hawk lowered its head, stretched its wings, refolded them. It transferred its attention to his outstretched hand.
Kynes found that he no longer had the strength to croak at it.
"The historical system of mutual pillage and extortion stops here on Arrakis," his father said. "You cannot go on forever stealing what you need without regard to those who come after. The physical qualities of a planet are written into its economic and political record. We have the record in front of us and our course is obvious."