Animal Kings: Ants, like these workers carrying eggs to a plant's leaf after rain flooded their nest, have a combined biomass estimated in the billions of tons. Gurinder Osan/AP hide caption

toggle caption
Gurinder Osan/AP

More, please. Chung Sung-Jun/Getty Images hide caption

toggle caption
Chung Sung-Jun/Getty Images

When Governments Pay People To Have Babies

  • Download
  • <iframe src="https://www.npr.org/player/embed/141943008/141968978" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript

A South Korean man takes a photo of his baby during a picnic in Seoul, in 2009. After years of promoting family planning, South Korea is seeing unprecedented numbers of women staying single into their 30s — up from a handful a generation ago to 40 percent. Jung Yeon-Je/AFP/Getty Images hide caption

toggle caption
Jung Yeon-Je/AFP/Getty Images

The population of Karachi, Pakistan, has been boosted by a new influx of young people. And now the city, seen here during a political rally in January, is making a bid to attract global elites.

Rizwan Tabassum/AFP/Getty Images hide caption

toggle caption
Rizwan Tabassum/AFP/Getty Images

In Karachi, New Aspirations To Be A Global Player

  • Download
  • <iframe src="https://www.npr.org/player/embed/141915310/141915431" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript

The world's population has just hit 7 billion people and continues to grow. Population experts are concerned about the rise in consumption that will accompany the increase in people. One California home builder, ZETA Communities, designs and builds small, highly energy-efficient homes.

Zeta Communities hide caption

toggle caption
Zeta Communities

As Population, Consumption Rise, Builder Goes Small

  • Download
  • <iframe src="https://www.npr.org/player/embed/141868233/141895710" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript

Op-Ed: 7 Billion Now, But Population Will Drop

  • Download
  • <iframe src="https://www.npr.org/player/embed/141870269/141870264" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript

7 Billion: Trick Or Treat For Crowded Countries?

  • Download
  • <iframe src="https://www.npr.org/player/embed/141861628/141861621" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript

Several babies born today have been deemed the symbolic 7 billionth person — including a little girl named Nargis in Lucknow, India. Here she is with her mother, Vinita.

Rajesh Kumar Singh/AP hide caption

toggle caption
Rajesh Kumar Singh/AP

Watch as global population explodes from 300 million to 7 billion.

Adam Cole, Maggie Starbard/NPR hide caption

toggle caption
Adam Cole, Maggie Starbard/NPR

Visualizing How A Population Grows To 7 Billion

  • Download
  • <iframe src="https://www.npr.org/player/embed/141816460/141855718" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript

Lujiazui, Shanghai's financial district, includes the world's third- and sixth-tallest buildings. The city's population is 23 million.

Frank Langfitt/NPR hide caption

toggle caption
Frank Langfitt/NPR

Nations Grow Populations, And Face New Problems

  • Download
  • <iframe src="https://www.npr.org/player/embed/141808114/141855720" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript

Newborns lie together at a district women's hospital in Allahabad, in India's most populous state of Uttar Pradesh. Fifty-one babies are born in India every minute.

Rajesh Kumar Singh/AP hide caption

toggle caption
Rajesh Kumar Singh/AP

When Humans Hit 7 Billion, Will It Happen In India?

  • Download
  • <iframe src="https://www.npr.org/player/embed/141811419/141812234" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript

Indian schoolchildren write English alphabets on slates at a primary school outside Hyderabad in June. India is on track to overtake China as the most populous nation in just 16 years. Noah Seelam/AFP/Getty Images hide caption

toggle caption
Noah Seelam/AFP/Getty Images