Can you think of any reason(s) why china allows only one child per couple? should government intervene in population growth?

Can someone me with this plz? ! i'm putting 20 points on it!

Based on current rates the earths human population is expected to grow how much by 2050

What effect has the drug trade had on some governments in middle and south america? a. it has funded political instability. b. many nations have created democratic governments. c. many governments have allowed the drug trade to fund local programs. d. it has funded political stability.