Misc
The Elemental Composition of the Human Body
The Elemental Composition of a Human Body
The human body is a miraculous, well-oiled, and exceptionally complex machine. It requires a multitude of functioning parts to come together for a person to live a healthy life—and every biological detail in our bodies, from the mundane to the most magical, is driven by just 21 chemical elements.
Of the 118 elements on Earth, just 21 of them are found in the human body. Together, they make up the medley of divergent molecules that combine to form our DNA, cells, tissues, and organs.
Based on data presented by the International Commission on Radiological Protection (ICRP), in the above infographic, we have broken down a human body to its elemental composition and the percentages in which they exist.
These 21 elements can be categorized into three major blocks depending on the amount found in a human body, the main building block (4 elements), essential minerals (8 elements), and trace elements (9 elements).
The Elemental Four: Ingredients for Life
Four elements, namely, oxygen, carbon, hydrogen, and nitrogen, are considered the most essential elements found in our body.
Oxygen is the most abundant element in the human body, accounting for approximately 61% of a person’s mass. Given that around 60-70% of the body is water, it is no surprise that oxygen and hydrogen are two of the body’s most abundantly found chemical elements. Along with carbon and nitrogen, these elements combine for 96% of the body’s mass.
Here is a look at the composition of the four elements of life:
Element | Weight of Body Mass (kg) | Percentage of Body Mass (%) |
---|---|---|
Oxygen | 43 kg | 61.4% |
Carbon | 16 kg | 22.9% |
Hydrogen | 7.0 kg | 10.0% |
Nitrogen | 1.8 kg | 2.6% |
Values are for an average human body weighing 70 kg.
Let’s take a look at how each of these four chemical elements contributes to the thriving functionality of our body:
Oxygen
Oxygen plays a critical role in the body’s metabolism, respiration, and cellular oxygenation. Oxygen is also found in every significant organic molecule in the body, including proteins, carbohydrates, fats, and nucleic acids. It is a substantial component of everything from our cells and blood to our cerebral and spinal fluid.
Carbon
Carbon is the most crucial structural element and the reason we are known as carbon-based life forms. It is the basic building block required to form proteins, carbohydrates, and fats. Breaking carbon bonds in carbohydrates and proteins is our primary energy source.
Hydrogen
Hydrogen, the most abundantly found chemical element in the universe, is present in all bodily fluids, allowing the toxins and waste to be transported and eliminated. With the help of hydrogen, joints in our body remain lubricated and able to perform their functions. Hydrogen is also said to have anti-inflammatory and antioxidant properties, helping improve muscle function.
Nitrogen
An essential component of amino acids used to build peptides and proteins is nitrogen. It is also an integral component of the nucleic acids DNA and RNA, the chemical backbone of our genetic information and genealogy.
Essential and Supplemental Minerals
Essential minerals are important for your body to stay healthy. Your body uses minerals for several processes, including keeping your bones, muscles, heart, and brain working properly. Minerals also control beneficial enzyme and hormone production.
Minerals like calcium are a significant component of our bones and are required for bone growth and development, along with muscle contractions. Phosphorus contributes to bone and tooth strength and is vital to metabolizing energy.
Here is a look at the elemental composition of essential minerals:
Element | Weight of Body Mass (g) | Percentage of Body Mass (%) |
---|---|---|
Calcium | 1000 g | 1.43% |
Phosphorus | 780 g | 1.11% |
Potassium | 140 g | 0.20% |
Sulphur | 140 g | 0.20% |
Chlorine | 100 g | 0.14% |
Sodium | 95 g | 0.14% |
Magnesium | 19 g | 0.03% |
Iron | 4.2 g | 0.01% |
Values are for an average human body weighing 70 kg.
Other macro-minerals like magnesium, potassium, iron, and sodium are essential for cell-to-cell communications, like electric transmissions that generate nerve impulses or heart rhythms, and are necessary for maintaining thyroid and bone health.
Excessive deficiency of any of these minerals can cause various disorders in your body. Most humans receive these minerals as a part of their daily diet, including vegetables, meat, legumes, and fruits. In case of deficiencies, though, these minerals are also prescribed as supplements.
Biological Composition of Trace Elements
Trace elements or trace metals are small amounts of minerals found in living tissues. Some of them are known to be nutritionally essential, while others may be considered to be nonessential. They are usually in minimal quantities in our body and make up only 1% of our mass.
Paramount among these are trace elements such as zinc, copper, manganese, and fluorine. Zinc works as a first responder against infections and thereby improves infection resistance, while balancing the immune response.
Here is the distribution of trace elements in our body:
Element | Weight of Body Mass (mg) | Percentage of Body Mass (%) |
---|---|---|
Fluorine | 2600 mg | 0.00371% |
Zinc | 2300 mg | 0.00328% |
Copper | 72 mg | 0.00010% |
Iodine | 13 mg | 0.00002% |
Manganese | 12 mg | 0.00002% |
Molybdenum | 9.5 mg | 0.00001% |
Selenium | 8 mg | 0.00001% |
Chromium | 6.6 mg | 0.00001% |
Cobalt | 1.5 mg | 0.000002% |
Values are for an average human body weighing 70 kg.
Even though only it’s found in trace quantities, copper is instrumental in forming red blood cells and keeping nerve cells healthy. It also helps form collagen, a crucial part of bones and connective tissue.
Even with constant research and studies performed to thoroughly understand these trace elements’ uses and benefits, scientists and researchers are constantly making new discoveries.
For example, recent research shows that some of these trace elements could be used to cure and fight chronic and debilitating diseases ranging from ischemia to cancer, cardiovascular disease, and hypertension.
Misc
Charted: The End-of-Life Recycling Rates of Select Metals
End-of-life recycling rates measure the percentage of a material that is recovered at the end of its useful life, rather than being disposed of or incinerated.

Charted: The End-of-Life Recycling Rates of Select Metals
This was originally posted on our Voronoi app. Download the app for free on Apple or Android and discover incredible data-driven charts from a variety of trusted sources.
We visualize the end-of-life recycling rates (EOL-RR) of commonly used metals in the economy. Data is sourced from the International Energy Agency, last updated in 2021.
Tracking recycling rates helps manage resources better and make smarter policies, guiding efforts to cut down on waste.
Ranked: The End of Life Recycling Rates of Select Metals
Gold has an 86% recycling rate according to the latest available data. Per the Boston Consulting Group, one-third of total gold supply was met through recycling between 1995–2014.
Metal | End-of-life recycling rate (2021) | 🔍 Used In |
---|---|---|
Gold | 86% | 💍 Jewelry / Electronics |
Platinum/Palladium | 60% | 🔬 Optical fibers / Dental fillings |
Nickel | 60% | 🔋 Batteries / Turbine blades |
Silver | 50% | 💍 Jewelry / Mirrors |
Copper | 46% | 🔌 Electrical wiring / Industrial equipment |
Aluminum | 42% | ✈️ Aeroplane parts / Cans |
Chromium | 34% | 🍽️ Stainless steel / Leather tanning |
Zinc | 33% | 🔗 Galvanizing metal / Making rubber |
Cobalt | 32% | 🔋 Batteries / Turbine engines |
Lithium | 0.5% | 🔋 Batteries / Pacemakers |
REEs | 0.2% | 📱 Mobile phones / Hard drives |
Note: Figures are rounded.
Several factors can influence metal recycling rates. According to this International Resource Panel report, metals that are used in large quantities (steel) or have a high value (gold) tend to have higher recycling rates.
However, for materials used in small quantities in complex products (rare earth elements in electronics), recycling becomes far more challenging.
Finally, a metal’s EOL-RR is strongly influenced by the least efficient link in the recycling chain, which is typically how it’s initially collected.
Learn More on the Voronoi App 
If you enjoyed this post, check out Critical Materials: Where China, the EU, and the U.S. Overlap which shows how critical materials are classified within different jurisdictions.
Misc
Companies with the Most Fossil Fuel and Cement CO2 Emissions
Half of the world’s total fossil fuel and cement carbon dioxide emissions in 2023 came from just 36 companies.

Companies with the Most Fossil Fuel and Cement CO2 Emissions
This was originally posted on our Voronoi app. Download the app for free on iOS or Android and discover incredible data-driven charts from a variety of trusted sources.
Key Takeaways
- Half of the world’s fossil fuel and cement carbon dioxide emissions in 2023 came from just 36 entities, according to a report by the Carbon Majors Project
- If Saudi Aramco were a country, it would be the fourth-largest polluter in the world, after China, the U.S., and India.
- Five publicly traded oil companies—ExxonMobil, Chevron, Shell, TotalEnergies, and BP—together accounted for 5% of global carbon dioxide emissions from fossil fuels.
Chinese Companies Dominate the List
This graphic is based on Carbon Majors, a database of historical production data from 180 of the world’s largest oil, gas, coal, and cement producers representing 169 active and 11 inactive entities.
In 2023, the top 20 highest carbon-producing entities were responsible for 17.5 gigatonnes of carbon dioxide equivalent (GtCO₂e) in emissions, accounting for 40.8% of global fossil fuel and cement CO₂ emissions. The list is largely dominated by state-owned companies, with 16 of the top 20 being state-controlled. Notably, eight Chinese entities contributed to 17.3% of global fossil fuel and cement CO₂ emissions in 2023.
Entity | Total emissions (MtCO2e) | Global CO2 emissions (%) |
---|---|---|
1 | Saudi Aramco | 4.4% |
2 | Coal India | 3.7% |
3 | CHN Energy | 3.7% |
4 | Jinneng Group | 2.9% |
5 | Cement industry of China | 2.8% |
6 | National Iranian Oil Company | 2.8% |
7 | Gazprom | 2.3% |
8 | Rosneft | 1.9% |
9 | Shandong Energy | 1.7% |
10 | China National Coal Group | 1.7% |
11 | Abu Dhabi National Oil Company | 1.6% |
12 | CNPC | 1.6% |
13 | Shaanxi Coal and Chemical Industry Group | 1.6% |
14 | Iraq National Oil Company | 1.3% |
15 | Shanxi Coking Coal Group | 1.3% |
16 | ExxonMobil | 1.3% |
17 | Sonatrach | 1.2% |
18 | Chevron | 1.1% |
19 | Kuwait Petroleum Corp. | 1.0% |
20 | Petrobras | 1.0% |
21 | Shell | 0.9% |
22 | Pemex | 0.9% |
23 | TotalEnergies | 0.8% |
24 | QatarEnergy | 0.8% |
25 | Lukoil | 0.8% |
26 | BP | 0.8% |
27 | Glencore | 0.7% |
28 | China Huaneng Group | 0.7% |
29 | Luan Chemical Group | 0.7% |
30 | Equinor | 0.7% |
31 | Peabody Energy | 0.7% |
32 | Nigerian National Petroleum Corp. | 0.6% |
33 | CNOOC | 0.6% |
34 | ConocoPhillips | 0.6% |
35 | Eni | 0.6% |
36 | Petronas | 0.5% |
Coal continued to be the largest source of emissions in 2023, representing 41.1% of emissions in the database and continuing a steady upward trend since 2016. Coal emissions grew by 1.9% (258 megatonnes of carbon dioxide equivalent – MtCO₂e) from 2022, while cement saw the largest relative increase at 6.5% (82 MtCO₂e), driven by expanding production.
In contrast, natural gas emissions fell by 3.7% (164 MtCO₂e), and oil emissions remained stable with only a slight increase of 0.3% (73 MtCO₂e).
Learn More on the Voronoi App 
To learn more about this topic, check out this graphic that shows greenhouse gas emissions by sector in 2023, according to data was compiled by the United Nations. The power sector remains the largest emissions contributor.
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