> ## Content Index
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# Biomass - How Much Does Life on Earth Weigh?
- URL: https://www.cascadepbs.org/show/its-okay-be-smart/episode/where-did-life-come-from-epipsk/
- Published: 2024-04-02T23:16:50.000Z
- Updated: 2025-08-20T09:55:45.000Z
- Description: We break down the concept of “biomass” to judge Earth’s living things from top to bottom.
- Author: Cascade PBS Staff
- Tags: Be Smart, Season 6, Episode 17, #ZZZ_Episode_2f7e3dd5-f8b3-48f4-89df-407ed5de19b1, #episode, #ZZZ_Show_dc38a6e9-266e-43c1-b647-45e7445fad27, #v1.16

Are humans really Earth’s most dominant species? Let’s put all of the planet’s living things on a scale and see what has amassed the most mass. This week we break down the concept of “biomass” to judge Earth’s living things from top to bottom, and see how humans have changed the world.