The world at seven billion

The UN is set to announce that the population of the planet has now reached seven billion people.

But will this number continue to rise in future years - and if so, what could this mean?

The BBC's Fergus Walsh crunches the numbers to find out.

Production: Anna-Marie Lever, John Galliver, Emily Jones. Design: David Gordon, George Spencer, Amanda Constantino.

Camera: Tony Dolce, Graham Hodson and Julius Peacock.