1 Scientist generally agree that earth is getting warmer due to what is called the greenhouse effect.2 A greenhouse stays warm because sunlight and heat coming through the classroom are mostly trapped. 3 The heat doesn’t radiate back into the atmosphere because it is held in by the glass. 4 something like that happens on earth.5 The atmosphere acts like a blanket that keeps the sun tea from leaking away into space. What is the main conclusion you are to draw from this paragraph?

A. The greenhouse effect is changing earths atmosphere.
B. Glass ceilings are important to greenhouses
C. The suns heat can easily leak away into space
D. Greenhouses help most plants to grow more quickly