Abstract
Human action famously transforms the Earth and its biosphere and geosphere.1 While most literature consider plowing, burning, debris, and other products and by-products of our activities, direct effects of changing human biomass might merit further study. Humans are now the dominant terrestrial vertebrate, composing about 1/3 of land vertebrate biomass, which translates to 1/10 of total vertebrate biomass.2 The other terrestrial 2/3 consists nearly entirely of livestock kept by humans for food. Non-domesticated land vertebrates, from shrews to elephants to swallows, form a mere 3%.
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