catch up pt 2

- there's over 7.5 billion people on the planet right now

-increases by over 73 million each year

-90% of the population growth takes place in Africa, south and east Asia, and Latin America

-in 1804, the population was 1 billion

-in 1927, the population was 2 billion

-in 1960, the population was 3 billion

-in 1974, the population was 4 billion

-in 1987, the population was 5 billion

-in 1999, the population was 6 billion

-in 2011, the population was 7 billion

-in about 2023, the population will be around 8 billion

-life expectancy is the average number of years to be lived by a group of people born in the same year

-crude death rate is the number of any type of death per 1000 of the population

-crude birth rate is the number of births per 1000 of the population