Use the sentences in the box to complete the conversation. Then practise it in pairs.
A. First, deforestation leads to more CO2 in the air B. I think it’s cutting down or burning forests C. This also makes the earth even warmer D. Well, there are two main reasons |
Mark: Mai, which human activity is the main cause of global warming?
Mai: (1) __________________________________ .
Mark: Why do you think so?
Mai: (2) ___________________________. (3) ___________________________. Trees use CO2 to grow, so when they are cut down or burnt, CO2 in the air increases.
Mark: I see.
Mai: (4) ___________________________. Forests store carbon in the trees and soil, and help reduce the global temperature. That’s why I think cutting down or burning forests is the most serious problem.