The mass of human-made materials now equals the planet’s biomass – “Anthropogenic” mass is doubling every twenty years

Biomass and anthropogenic mass estimates since the beginning of the twentieth century on a dry-mass basis. The green line shows the total weight of thebiomass (dashed green lines, ±1 s.d.). Anthropogenic mass weight is plotted as an area chart, where the heights of the coloured areas represent the mass of the corresponding category accumulated until that year. The anthropogenic mass presented here is grouped into six major categories. The year 2020±6 marks the time at which biomass is exceeded by anthropogenic mass. Anthropogenic mass data since 1900 were obtained from ref. 22, at a single-year resolution. The current biomass value is based on ref. 11, which for plants relies on the estimate of ref. 10, which updates earlier, mostly higher estimates. The uncertainty of the year of intersection was derived using a Monte Carlo simulation, with 10,000 repeats. Data were extrapolated for the years 2015–2025 (lighter area). Graphic: Elhacham, et al., 2020 / Nature — Biomass and anthropogenic mass estimates since the beginning of the twentieth century on a dry-mass basis. The green line shows the total weight of thebiomass (dashed green lines, ±1 s.d.). Anthropogenic mass weight is plotted as an area chart, where the heights of the coloured areas represent the mass of the corresponding category accumulated until that year. The anthropogenic mass presented here is grouped into six major categories. The year 2020±6 marks the time at which biomass is exceeded by anthropogenic mass. Anthropogenic mass data since 1900 were obtained from ref. 22, at a single-year resolution. The current biomass value is based on ref. 11, which for plants relies on the estimate of ref. 10, which updates earlier, mostly higher estimates. The uncertainty of the year of intersection was derived using a Monte Carlo simulation, with 10,000 repeats. Data were extrapolated for the years 2015–2025 (lighter area). Graphic: Elhacham, *et al.*, 2020 / *Nature*

9 December 2020 (Weizmann Institute of Science) – Earth circa 2020: The mass of all human-produced materials – concrete, steel, asphalt, etc. – has grown to equal the mass of all life on the planet, its biomass. According to a new study at the Weizmann Institute of Science, we are right at this tipping point, and humans are currently adding new buildings, roads, vehicles and products at a rate that is doubling every 20 years, leading to a “concrete jungle” that is predicted to reach over two teratonnes (i.e. two million million) – or more than double the mass of living things, by 2040.

The study, published today [pdf] in Nature and conducted in the group of Prof. Ron Milo of the Plant and Environmental Sciences Department by Emily Elhacham and Liad Ben Uri, shows that at the outset of the 20^th century, human-produced “anthropogenic mass” equaled just around 3% of the total biomass. How did we get from 3% to an equivalent mass in just over a century? Not only have we humans quadrupled our numbers in the intervening years, the things we produce have far outpaced population growth: Today, on average, for each person on the globe, a quantity of anthropogenic mass greater than their body weight is produced every week.

The upswing is seen markedly from the 1950s on, when building materials like concrete and aggregates became widely available. In the “great acceleration” following World War II, spacious single-family homes, roads and multi-story office buildings spang up around the US, Europe and other countries. That acceleration has been ongoing for over six decades, and those two materials, in particular, make up a major component of the growth in anthropogenic mass.

What do we have more of in the world, by mass: Concrete or animals? Plastic or plants? And can we identify the tipping point when one will outweigh the other? Prof. Ron Milo, of the Weizmann Institute of Science, has analyzed the proportions of anthropomass (human-made) to biomass on planet Earth, and has some interesting answers to these questions. Video: Weizmann Institute of Science

“The study provides a sort of ‘big picture’ snapshot of the planet in 2020. This overview can provide a crucial understanding of our major role in shaping the face of the Earth in the current age of the Anthropocene. The message to both the policy makers and the general public is that we cannot dismiss our role as a tiny one in comparison to the huge Earth. We are already a major player and I think with that comes a shared responsibility.” says Milo.

Referring to the dynamics of the human-made materials in our world as a “socio-economic metabolism,” the study invites further comparison with the way that natural materials flow through the planet’s living and geologic cycles. “By contrasting human-made mass and biomass over the last century, we bring into focus an additional dimension of the growing impact of human activity on our planet,” says Elhacham.

Milo: “This study demonstrates just how far our global footprint has expanded beyond our ‘shoe size.’ We hope that once we all have these somewhat shocking figures before our eyes, we can, as a species, behave more responsibly.”

Milo and Elhacham teamed with graphic designer Itai Raveh to create a website, Anthropomass.org, to help explain these figures in clear, simple terms.

The Mass of Human-Made Materials Now Equals the Planet’s Biomass

Biomass (dry and wet), anthropogenic mass and anthropogenic mass waste estimates since the beginning of the twentieth century. Green lines show the total weight of biomass (± 1 s.d.). Anthropogenic mass weight is plotted as an area chart. The wet-weight estimate is based on the results presented in Fig.1 and the respective water content of major components (seeMethods). The year 2013±5 marks the time at which the dry biomass is exceeded by the anthropogenic mass, including waste. The years 2037±10 and 2031±9 mark the times at which the wet biomass is exceeded by the anthropogenic mass and the total produced anthropogenic mass, respectively. The uncertainties of the years of intersection were derived using a Monte Carlo simulation, with 10,000 repeats (seeMethods). Weights are extrapolated for the years 2015–2037 (lighter area). Graphic: Elhacham, et al., 2020 / Nature — Biomass (dry and wet), anthropogenic mass and anthropogenic mass waste estimates since the beginning of the twentieth century. Green lines show the total weight of biomass (± 1 s.d.). Anthropogenic mass weight is plotted as an area chart. The wet-weight estimate is based on the results presented in Fig. 1 and the respective water content of major components. The year 2013±5 marks the time at which the dry biomass is exceeded by the anthropogenic mass, including waste. The years 2037±10 and 2031±9 mark the times at which the wet biomass is exceeded by the anthropogenic mass and the total produced anthropogenic mass, respectively. The uncertainties of the years of intersection were derived using a Monte Carlo simulation, with 10,000 repeats (seeMethods). Weights are extrapolated for the years 2015–2037 (lighter area). Graphic: Elhacham, *et al.*, 2020 / *Nature*

ABSTRACT: Humanity has become a dominant force in shaping the face of Earth^{1,2,3,4,5,6,7,8,9}. An emerging question is how the overall material output of human activities compares to the overall natural biomass. Here we quantify the human-made mass, referred to as ‘anthropogenic mass’, and compare it to the overall living biomass on Earth, which currently equals approximately 1.1 teratonnes^10,11. We find that Earth is exactly at the crossover point; in the year 2020 (± 6), the anthropogenic mass, which has recently doubled roughly every 20 years, will surpass all global living biomass. On average, for each person on the globe, anthropogenic mass equal to more than his or her bodyweight is produced every week. This quantification of the human enterprise gives a mass-based quantitative and symbolic characterization of the human-induced epoch of the Anthropocene.