【单选题】Scientists have long believed one way to stop the Earth’s atmosphere from warming is by planting more trees. The idea is that more trees will take in or absorb some of the carbon dioxide in the atmosp...
A.
Introduce some new ideas about the relationship between trees and carbon dioxide.
B.
Introduce recent condition of global industrial pollution.
C.
Call on people to plant more trees to reduce greenhouse gases.
D.
Point out that power companies should be responsible for the rising levels of carbon dioxide.