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

List of biomes that can spawn in this world

Mushroom Fields, Warm Ocean, Stony Shore, River, Windswept Savanna, Desert, Eroded Badlands, Badlands, Wooded Badlands, Mangrove Swamp, Lush Caves, Dripstone Caves, Deep Dark