The best replacement for biomes is ecosystems.

The best alternatives to biomes are rated as following:
★★★★★  ecosystems
★★★★★  habitats
★★  ecosystem
★  default
★  aquatic biomes
  aquatic

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Speaking about biomes, one probably shouldn't forget about permafrost.

Other search terms related to biomes and their ratings are:
★★★★★ permafrost
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Google Trends

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biomes
ecosystems
habitats