Our planet was home to less than 1 billion people until 1804, We crossed the two billion mark in 1927, more than 100 years later.

The rise of the world’s population in the form of a hockey stick has been attributed to modern medicine and public healthcare.

Tuesday was the last day that the marker was activated. the United Nations said The world’s population has now reached eight billion. This is just eleven years after the seven billion mark. (It’s an imprecise number as there is no official count. But, the international organisation claimed its projections had crossed the line on Tuesday.

Globally, the growth rate has been uneven across the globe. It is expected that it will slow in the next decades. Some are concerned about the slowing growth in populous countries such as China and the United States, which could threaten to disrupt their societies. Systems already in trouble are at risk from rising birthrates in less developed countries.

These are some of the challenges you will face.

The United Nations stated that 70% of the growth to 8 billion people from 7 billion occurred in low- and middle-income countries. In the years to come, this trend will likely be even more prominent.

“When the next billion is added between 2022 and 2037, these two groups of countries are expected to account for more than 90 percent of global growth,” the organization said.

Globally, fertility rates have dropped. In high-income countries, the United Nations stated that the number of people below 65 years old is likely to decrease in the next few years. However, the fertility rate remains stubbornly high for poorer countries where more girls and women are unable to access sexual and reproductive health services, including contraception.

Meeting the needs — including education, public health, employment, and water and sanitation — created by that growth will require “a significant increase in public expenditures,” According to the organization.

Experts believe that increasing population has contributed to an unsustainable growth rate in consumption. According to the United Nations, it has led to many environmental problems, including climate change and loss of biodiversity.

“Slower population growth over many decades could help to mitigate the further accumulation of environmental damage in the second half of the current century,” According to the organization.

Low-income countries have contributed significantly less to climate changes than those with high incomes. However, as the poorer population grows, so does their contribution to climate change. “their energy consumption will need to increase substantially if they are to develop economically,” According to the organization.

Although it took eleven years for the population of seven billion to grow to eight million, the United Nations predicted that we would reach nine billion by 2037. Another 22 years will be needed to reach 10 billion by 2058.

“A decline in the world’s population is not expected for another half-century, with the exact date depending largely on the future pace of fertility decline in today’s high-fertility countries,” According to the organization.

China’s births hit a historic low in 2021, a fact that, coupled with its increased life expectancy, could lead to labor shortages and hampered economic growth. The United States has also seen a slowdown in growth, growing at the lowest rate since the 1930s and the fastest over the past ten years.

India is expected to surpass China as the world’s most populous nation in 2023, the United Nations said in July.