Climate as World Constraint
Climate determines what is possible in a world. A desert civilization cannot have the same agricultural base, the same military tactics, the same architecture, or the same relationship to water as a temperate one. A society built on a frozen tundra organizes its economy, its social structures, and its spiritual life differently than one in a tropical rainforest. When you build a world, the climate is not decoration added after the fact; it is the foundational constraint that determines what all the other systems look like. Writers who get climate right make worlds that feel like they would work even without the story happening in them.