Read the text. Choose the correct option.

Should We Eat Less Meat?
Since the 1960s people have eaten more and more meat. One reason for the increase in the popularity of meat is the rise of fast-food restaurants. Some scientists think the increase in the 1) ... of meat that people eat is going to be a 2) ... problem in the future because the world’s population is 3) ... to grow from 7 billion to more than 9 billion. As meat is 4) ... more popular in some Asian countries, scientists say that the amount of meat we eat will keep going 5) ... . What scientists are 6) ... of is that it takes a lot of water and energy to grow the crops needed to 7) ... farm animals. A lot of land 8) ... also needed to grow the food that farm animals eat, which could be used to produce crops for people to eat 9) ... . However, other scientists say that meat may become so expensive to produce that people won’t go 10) ... buying it.