On World Population Day, National Geographic Contest Photos Show Living Space On Our Populous Planet : Goats and Soda Earth's crowded — and remote — spots are highlighted in entries to the 2016 National Geographic Travel Photographer of the Year Contest.
NPR logo PHOTOS: For #WorldPopulationDay, How Earth's 7 Billion Live

PHOTOS: For #WorldPopulationDay, How Earth's 7 Billion Live

School dormitories at South China Normal University in Guangzhou, China. Wing Ka H./Courtesy of National Geographic Travel Photographer of the Year Contest hide caption

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Wing Ka H./Courtesy of National Geographic Travel Photographer of the Year Contest

School dormitories at South China Normal University in Guangzhou, China.

Wing Ka H./Courtesy of National Geographic Travel Photographer of the Year Contest

As of this morning, there were 7.3 billion-plus people living on Earth, according to the Census Bureau's World Population Clock. And the number goes up second by second because babies keep being born.

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That's a statistic to ponder today, July 11, which has been designated World Population Day by the United Nations Development Program. The idea is to focus on "population issues," which touch on many pressing concerns in the world today — from maternal mortality to climate change. This year's theme is "investing in teenage girls" — making sure they can stay in school and get the information they need about health, human rights and reproductive rights.

It's also a day to think about the living spaces of the world's ever-growing population. The 2016 National Geographic Travel Photographer of the Year Contest gives you an idea of how crowded a world of 7 billion can feel: People literally live on top of one another in China's high-rise dormitories. Yet there is still great solitude in some of Earth's remote spots, like a mountain village in India.

Here are some images that showcase our populous planet.

Note: The captions were provided by the photographers and were edited for length and clarity.

A Kinnaura tribal woman in a village in Himachal Pradesh, a state in India's Himalayan highlands, carries a log for a home fire. Mattia Passarini/Courtesy of National Geographic Travel Photographer of the Year Contest hide caption

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Mattia Passarini/Courtesy of National Geographic Travel Photographer of the Year Contest

A Kinnaura tribal woman in a village in Himachal Pradesh, a state in India's Himalayan highlands, carries a log for a home fire.

Mattia Passarini/Courtesy of National Geographic Travel Photographer of the Year Contest

A market in Bangkok, Thailand. Prasad Ambati/Courtesy of National Geographic Travel Photographer of the Year Contest hide caption

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Prasad Ambati/Courtesy of National Geographic Travel Photographer of the Year Contest

A market in Bangkok, Thailand.

Prasad Ambati/Courtesy of National Geographic Travel Photographer of the Year Contest

Visitors to the banks of India's Ganges River, regarded as sacred by Hindus. Massimo Rumi/National Geographic Travel Photographer of the Year Contest hide caption

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Massimo Rumi/National Geographic Travel Photographer of the Year Contest

Visitors to the banks of India's Ganges River, regarded as sacred by Hindus.

Massimo Rumi/National Geographic Travel Photographer of the Year Contest

Hong Kong is home to more than 7 million residents. Andy Yeung/Courtesy of National Geographic Travel Photographer of the Year Contest hide caption

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Andy Yeung/Courtesy of National Geographic Travel Photographer of the Year Contest

Hong Kong is home to more than 7 million residents.

Andy Yeung/Courtesy of National Geographic Travel Photographer of the Year Contest

Ho Chi Minh City as seen from the 12th floor of a hostel. The Vietnamese city was formerly known as Saigon. King Fung Wong/Courtesy of National Geographic Travel Photographer of the Year Contest hide caption

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King Fung Wong/Courtesy of National Geographic Travel Photographer of the Year Contest

Ho Chi Minh City as seen from the 12th floor of a hostel. The Vietnamese city was formerly known as Saigon.

King Fung Wong/Courtesy of National Geographic Travel Photographer of the Year Contest

Dhaka, Bangladesh, is said to be the rickshaw capital of the world, with hundreds of thousands in circulation. Zhen Li/Courtesy of National Geographic Travel Photographer of the Year Contest hide caption

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Zhen Li/Courtesy of National Geographic Travel Photographer of the Year Contest

Dhaka, Bangladesh, is said to be the rickshaw capital of the world, with hundreds of thousands in circulation.

Zhen Li/Courtesy of National Geographic Travel Photographer of the Year Contest