The correct matches are:
Industrial revolution - Population has increased by at least 38 million each year;
2050 - UN estimates a human population of 9 or 10 billion people;
Preindustrial society - High birthrates but few children live long enough to reproduce;
1950 to 2000 - Human population explodes;
In the preindustrial societies the birthrates have been very high, but the population has had only very slow and small increase over time. The main reason for this is that lot of children where not living long enough to reproduce, with the main reasons being the lack of medicine, bad living conditions, wars. After the industrial revolution everything seemed to become better in the lives of the people. The better living conditions resulted in longer life expectancy, thus the population started to steadily grow. After few years from the end of the World War II we have the ''baby boom'' period, staring roughly at 1950. From this year, up until 2000, the world population exploded, with the main reasons being the advances in the medicine, lack of wars, significantly improved living conditions. The world population is predicted to continue to grow, though with much slower rate, so the UN estimates that by 2050 there will be between 9 and 10 billion people on the Earth.
