global population numbers and patterns

Question 1

until 1804 what did the worlds population stay below?

Answer 1

1 bn

Question 2

how many years did it take for population growth to reach 2 bn?

Answer 2

100 years classified as exponential growth

Question 3

since when has global population numbers been increasing rapidly?

Answer 3

1960s

Question 4

how much is population estimated to reach by 2050?

Answer 4

9 bn