If the population of a country doubles every 25 years, a 1980 population of 10 million will reach 80 million in the year
a. 2005.
b. 2030.
c. 2055.
d. 2080.
e. 2105.
Question 2
Suppose that we allowed each person 1000 m3 of living space in a large building, with ceiling height 3 m.
To the nearest order of magnitude, how many 1000 m high
buildings would have to be built to house the entire population of 8.5 x 1014 people on the
energy-limited Earth if each building's base were 100 km on a side?
a. 101
b. 102
c. 105
d. 108
e. 1013
Population predictions for 2000–2050, using three different total fertility rates (
Possible Earth 5 billion years from now
Jean-Paul Sartre (1905‑1980).
Agriculture in 10,000 years ago
Population age 65 and over and age 85 and over, selected years 1900-2008 and projected 2010-2050.
Grade 1 math Adding doubles