What does the man say we can do to deal with oil crisis?

W: How do you feel about oil crisis?
M: It’s frightening. Maybe there will be wars about oil. We need to find alternative energy sources very soon. Any alternatives do you know?
W: I think wind energy and wave energy would play important parts in our lives in the future.

W: So, Professor Taylor, I’d like you to tell us what is likely to be the biggest problem we’ll have to face in the future?
M: Well, the most alarming problem is still world population. In 1948, there were 2 billion inhabitants on the earth and in 1992 that figure had more than doubled to over 5 billion and by the year 2020, it’s estimated that it will increase to over 8. 5 billion.
W: There’ll be more famines and more wars.