What is the name of the climate zone that covers the majority of the Sahara Desert?

Which biome is known for its coniferous evergreen trees and cold winters? What climate zone is characterized by limited vegetation and permafrost? What biome is dominated by coral and is found in tropical oceans? What is the dominant climate zone of the Amazon rainforest? What is the dominant climate zone of the Gobi Desert? What is the main characteristic of the Mediterranean biome? What is the primary language spoken in Japan? What is the main language spoken in Brazil?