* Russian Exploration and Influence: Russia has a vast territory encompassing both tundra and taiga biomes. Russian explorers, scientists, and fur traders were among the first Europeans to extensively study and document these environments.
* Lack of Equivalents in Other Languages: While other European languages might have had descriptive terms for these environments, there wasn't a single, established word that captured the essence of tundra and taiga like the Russian words did.
* Scientific and Academic Adoption: Russian scientific literature and exploration journals contributed to the widespread adoption of the words "tundra" and "taiga" in scientific and academic circles across Europe and eventually, the world.
Therefore, the Russian words, reflecting their long experience with these biomes and the lack of equivalent terms elsewhere, were adopted by the English language.