I would say about 2 million years.Now that is way off what the dinosaurs lived but we might be able to live more than that unless we run out of natural resourses.
Since people are both being born all the time and dying all the time, you can never get a precise figure for the global population at any given moment, however, the world's total population is...
That really depends on when you believe the first human being was born. many people believe this was about 10,000 BC, the number you are looking for is around 20 Billion 7 Billion are currently alive...
None. Even though the two terms sound as if they're two forms of the same thing, they're not. A "year" is a period of time. It's the time between two of the same person's birthdays, the time between...