Which of the following reasons is not the reason of the conclusion “Helping students have a better understanding of greenhouse gases and their impact on the temperature of the Earth is urgent”?
选项：

A:There is little understanding of the greenhouse effect in science class.
B:Students should learn about the role of each concept in the greenhouse effect.
C:Some students have incorporated this misconception into their knowledge frameworks of global warming.
D:Many confused the greenhouse effect with global warming.