How Has the Number of Humans and Domestic Animals Changed?

The total mass of all humans and domestic animals increased by nearly 3.5 times from 1900 through the early 21st century. This increase is thought to be the result of more easily accessible sources of food. The population of wild animals did not follow the same trend as domestic animals — it actually decreased by an estimated 25% from 1960 through the early 2000s. For example, in 1900, the total mass of all humans was four times more than the world’s elephants, and by the year 2000, humans accounted for 200 times more mass than elephants. This was because of an increase in the human population and a decrease in the elephant population.

More about humans and animals:

• The world’s cattle population weighs 16 times more than the combined weight of the world’s wild mammals.


• About 93 pounds (42 kg) of meat were produced for every person in the world in 2007, and meat production was projected to double by 2050.


• Chickens were the animal that had the fastest growth rate during the late 20th century and early 21st century, with an increase from 3.9 billion chickens in 1961 to 19 billion in 2011.

Frequently Asked Questions

How has the global human population changed over time?

According to the United Nations, the global human population has seen a dramatic increase, growing from 1 billion in the early 19th century to 7.8 billion as of 2020. This exponential growth is attributed to advancements in medicine, agriculture, and technology, leading to longer lifespans and lower mortality rates.

What is the current trend in the number of domestic animals worldwide?

The number of domestic animals, particularly livestock, has risen in tandem with the human population to meet the growing demand for animal products. The Food and Agriculture Organization reports that livestock numbers have more than doubled since the 1960s, with poultry populations experiencing the most significant increase.

How does the increase in domestic animals impact the environment?

The surge in domestic animal populations, especially livestock, has significant environmental impacts. It contributes to deforestation, water pollution, and greenhouse gas emissions. The livestock sector is estimated to emit about 14.5% of all anthropogenic greenhouse gas emissions, as per the Food and Agriculture Organization.

Are there any species of domestic animals that are declining in number?

While overall numbers of domestic animals like cattle, chickens, and pigs are increasing, some heritage and traditional breeds are in decline. The Livestock Conservancy has highlighted that industrial farming favors certain breeds for their productivity, leading to a loss of genetic diversity among domesticated species.

What are the implications of human population growth on wildlife?

Human population growth poses a significant threat to wildlife through habitat destruction, overexploitation, and climate change. Expanding human settlements and agriculture displace wildlife, while increased demand for resources leads to overfishing and hunting. The World Wildlife Fund has documented a 68% decline in global wildlife populations between 1970 and 2016.

How can we balance the needs of a growing human population with animal welfare and environmental sustainability?

Balancing human needs with sustainability requires a multifaceted approach. Strategies include adopting sustainable farming practices, protecting natural habitats, and promoting plant-based diets to reduce reliance on animal agriculture. Organizations like the Sustainable Development Solutions Network advocate for policies that integrate economic, social, and environmental goals to achieve this balance.