1

Human Population

Population Explosion• 1830 population at 1 billion.• 1930 population at 2 billion

(100 yr. doubling time).• 1975 population at 4 billion

(45 yr. doubling time).• 1999 Population hit 6 billion on Oct.

12th• Current population:

http://www.census.gov/cgi-bin/ipc/popclockw

Population density map of the world in 1994,

when the world's population was at 5.6 billion

2

dieback

3

1950 1960 1970 1980 1990 2000 2010 2020 2030 2040 2050

4

Global Inequity• Population and resources to sustain it are

not evenly distributed.• Countries with small (affluent) population

and life style supported by sophisticated technology (and excess use) demand a high proportion of resources.

• Countries with large population and a “survival” lifestyle produce low cost items for the affluent population.

5

Population Control• Birth Controls.

– Avoidance/Abstinence– Mechanical/Chemical (condom,

spermicides, diaphragms, cervical cap, vaginal sponge)

– Surgical (vasectomy, tubal ligation)– Chemical (pill, implants)– Physical to egg implantation - IUD– Abortion (surgical, chemical)