increase /ɪnˈkriːs/ (verb) to become greater in amount, number, value, etc.; to make something greater in amount, number, value, etc. Example: The number of injuries from automobile accidents increases every year.
probably /ˈprɑːbəbli/ (adverb) used to say that something is likely to happen or to be true Example: The decision to set up a new company is probably his most risky decision.
decrease /dɪˈkriːs/ (verb) to become smaller in size, number, etc.; to make something smaller in size, number, etc. Example: A high population growth rate decreases economic development.
double /ˈdʌbl/ (adjective) twice as much or as many as usual Example: The world population doubled from 1945 to 1970.
figure /ˈfɪɡjər/ (noun) a number representing a particular amount, especially one given in official information Example: These are all figures: 5, 12, 1997.
birth-control method /bə (noun) Example: Safe birth-control methods for family planning are not available to those living in the mountainous areas.
family planning /ˌfæməli ˈplænɪŋ/ (noun) the process of controlling the number of children you have by using contraception Example: Family planning is essential for each family and the whole society.
overpopulation /ˌəʊvərˌpɑːpjuˈleɪʃn/ (noun) the fact of a country or city having too many people living in it Example: Many environmental, social, and economic problems stem from the overpopulation problem.
raise animal /reiz 'æniməl/ Example: My grandparents raise many kinds of animals.
Third World /θə (noun) Example: Most of the countries in the Third Torld are very poor.