Last updated at 15:26 GMT, Thursday, 10 March 2011

Population explosion

View across a city

Alice and Finn talk about a population explosion in the world - and how engineers suggest it can be dealt with

Alice and Finn talk about a population explosion in the world - and how engineers suggest it can be dealt with.

This week's question:

How many zeros are there after the 1 in a billion?

a) 12

b) 9

c) 6

Listen out for the answer at the end of the programme!

Listen

Population explosion

End of Section

Grammar

population

the total number of people living in a particular country or region

billion

a thousand million (in some parts of the world a million million)

it's estimated

experts have made approximate calculations of how much something is likely to be or cost

projection

an expected outcome

explosion

here, a large, sudden increase

defining challenge

a difficult or demanding task that will shape or characterise related events

technological solution

the use of technology to solve a problem or find an answer

refrigeration

keeping something at a constant, cold temperature

transportation

moving things or people from one place to another

optimised

to have made something become as best as it can be

consumption

here, eating or drinking something

  1. Home
  2. General & Business English
  3. 6 Minute English
  4. Population explosion