Overpopulation – The Human Explosion Explained

Important Vocabulary Words From The Video


To fourfold something is to multiply it by four. When you fourfold a number, you get the number multiplied by 4 times the original number.

  • The teacher asked the students to fourfold their homework to make it easier to understand.
  • The company is trying to fourfold their sales this year.

Slums are neighborhoods that are usually very poor. They are usually located in cities, and they usually have a high rate of crime.

  • The slums are located near the city center.
  • The slums are a result of the city's rapid growth.

A megacity is a city that has a population of over 10 million people. There are currently only a few megacities in the world, and they are all in Asia.

  • The megacity is growing very quickly, and it's going to be hard to accommodate all of the new residents.
  • The megacity is a very dangerous place to live, and it's not safe for the people to go outside.

Ungrounded is a word that is used to describe something that is not grounded. This means that the thing is not connected to anything else, or it doesn't have any real weight.

  • The balloon was ungrounded, and it drifted away.
  • The argument was ungrounded, and there wasn't anything that could be done to stop it.

An apocalyptic event is a very bad thing. It can be anything from a natural disaster to a war. When people talk about an apocalyptic event, they are usually talking about a very bad thing that is going to happen.

  • There was an apocalyptic storm that swept across the country.
  • The war is apocalyptic because it's going to be very bad for the country.

Overpopulation is when there are too many people in a particular area, and it is causing problems. There is not enough space to live, and the resources that are available are not being used efficiently.

  • The overpopulation of the city is causing a lot of problems.
  • The overpopulation of the planet is causing a lot of problems.

To flourish is to grow and happen in a big way. When a plant flourishes, it grows tall and strong.

  • The flowers are flourishing because the weather is warm and humid.
  • The company is flourishing because they are making a lot of money.

The billionth is a number that is very large. It's equal to 1,000,000,000. This number is so large that it's impossible to say it with words.

  • The billionth baby was born this week.

When something doubles or multiplies, it's called doubling or multiplying. But when something increases by a hundredfold, it's called tenfold.

  • The company has tenfold the revenue that it had last year.
  • The price of the product has tenfold increased.