What is the estimated all time population of planet earth?

Question

Just curious.
Bonus points if you tell me an estimate on how many species have ever existed.

Answer 1

It is estimated that a total of 96.1 billion people have lived on the earth.

A simple model of population growth is an exponential model.
This model is broadly accurate, especially when an organism invades a new ecological niche and the environment seems to have infinite capacity for growth. This model accurately describes the initial growth of a bacterial culture in a fresh dish of growth medium, or the human population as it discovered agriculture. More refined models are needed as environmental and predatory constraints impinge, but this model works well with most human populations because many human populations rapidly shift from one environmental disequilibrium to another (and thus present a moving target that the environmental constraints fail to effectively constrain). It is of course never that simple: Black Death in Europe caused populations to drop dramatically for a few centuries.

Keyfitz assumed that exponential growth occured in various historical time intervals [A, B], but with possibly different constants C and r for each time interval. He chose C and r to match given values of P(t) at A and B. This requires solving two equations in 2 unknowns:

the total person-years from A to B is [P(B)-P(A)](B-A)/{Ln[P(B)]-Ln[P(A)]}.

This formula is now applied to a system of time intervals from 1,000,000 BC to the present. The sum of the total person-years for all these intervals gives the total person-years for all human life. By dividing by the average lifespan, one obtains an estimate of how many people have ever lived. The data at ends of intervals are taken from a recent textbook on population, except for the first data point of 2 people at -1,000,000. That data point was proposed by Keyfitz.

The estimate, therefore is that 96,100,000,000 people have lived on the earth.

Note: The current earth population is over 6.5 billion, estimated.
"On Saturday, Feb. 25, at 7:16 p.m. Eastern Standard Time, the population here on this good Earth is projected to hit 6.5 billion people." http://www.livescience.com/othernews/060224_world_population.html

As to species, "estimates of global biodiversity of mollusks are greatly underestimated. The same is probably true of other groups of animals in many different regions of the world on land, in freshwater, and in the sea." http://www.uga.edu/srel/ecoview11-4-02.htm

There are currently uncertainties, but "between four and six million" kinds of species are estimated to inhabit the earth.
The all time number of species is much greater that that of humans, and any estimate is going to be greatly off.

Answer 2

The present population of the world is around 7 billion.
By
"Estimated all time population" Do you mean the number of humans that have lived on the planet earth since its creation?
Then it would be around 100 billion assuming an average rate of growth of about 3% per annum and average human life of about 60 years.

Estimated number of species is around 10 billion.

Answer 3

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Answer 4

Around 6 billion and approx. 300 million in the USA.

Answer 5

around 6 billion...3 million of that is in the US

Answer 6

Last checked, it was 6.3 billion (est.)

Species: 100 billion (est.)

Answer 7

i think it's around 6.5 billions

Answer 8

4.5 billion
estimate of species um..... 2,346,500