It will not support the present global population for much longer.

However, similar studies are not carried out where a global population is at risk.

And, with a global population set to hit nine billion by 2050, how will we make sure everyone has enough to eat?

At the century's end, the global population was 6.1 billion and rising.

Between now and 2030, when the global population is expected to reach about eight billion, almost all the growth will be in cities.

Current estimates put the global population at between 20,000 and 25,000.

Global population now increases at the rate of 200,000 a day, or more than 8,000 an hour.

As of 2011, the global population is estimated to be less than 5 600 individuals.

Its global population is believed to be not less than 10,000 adults.

The current global population is estimated to be up to 500,000 individuals.