As in Cosmos, with the age of the earth considered as 1 year, then has world population not doubled twice over within the last three seconds
Isn't your sentence lacking a question mark?
If that is the case, the world population has doubled a lot more than twice in the last three seconds (437.6 years, earth age).
What math exactly do you want?
The time it takes for human population to double is not a constant.
I think he was using you to check his number on his homework.
Either way it is refreshing to see one of these people actually take a stab at it.
I also think there was a bit of garble in the English that may have change meaning a bit.
As the scientist who helped eradicate smallpox he certainly know a thing or two about extinction.
And now Professor Frank Fenner, emeritus professor of microbiology at the Australian National University, has predicted that the human race will be extinct within the next 100 years.
He has claimed that the human race will be unable to survive a population explosion and 'unbridled consumption.’
Fenner told The Australian newspaper that 'homo sapiens will become extinct, perhaps within 100 years.'