This datapack makes Minecraft generate biomes as if temperature was the lowest everywhere in the world. Biomes weren't chosen manually, these are the biomes Minecraft generates when temperature is the lowest.

List of biomes that can spawn in this world

Mushroom Fields, Deep Frozen Ocean, Frozen Ocean, Stony Shore, Snowy Beach, Frozen River, Windswept Gravelly Hills, Windswept Hills, Windswept Forest, Ice Spikes, Snowy Plains, Snowy Taiga, Taiga, Snowy Slopes, Grove, Jagged Peaks, Frozen Peaks, Lush Caves, Dripstone Caves, Deep Dark