Here is the paper that the article is based on: The biomass distribution on Earth - https://www.pnas.org/content/115/25/6506 https://www.pnas.org/content/115/2

Here is the paper that the article is based on: The biomass distribution on Earth - https://www.pnas.org/content/115/25/6506 https://www.pnas.org/content/115/25/6506 > ≈550 gigatons of carbon (Gt C) of biomass distributed among all of the kingdoms of life A gigaton is 1 billion metric tons, or 1 trillion kilograms. So the total mass is about 550,000,000,000,000 kg.