 Which of these is not a lasting effect of the Ryzgas?
Var saw with some surprise that all the walls were sheathed in ice—warm to the touch, bound fast against melting by the Watcher's will. And before very long, I'm sure, I would have performed some deed which Groz would recognize as a worthy exploit, and would thus have healed the feud between our families. "Because of them we must build with dreams instead of iron, and our only fire is that of the Sun, and even now, two thousand years later, the Earth is still slowly recovering from the pangs and poison of that age. Meanwhile they redoubled the yoke and the punishments, hastening the completion of the last of the starships. "Some of the Ryzgas took flight to the stars, and some perished on Earth.
 An increase in technological advancements
 Climate change on the planet  An increase in technological advancements  Use of limited resources  General fear between groups of people