Letter C. They emit water vapor, which cools the atmosphere.
There are already several studies that prove that green roofs contribute to decrease the heat of the place and consequently helps in the fight against global warming. And it can positively affect climate change.
Experts say that depending on the region and geographical area, is completely dispensable the use of air conditioning, an example of using green roofs.
In this film, Al Gore is on a lecture circuit, as the former presidential candidate campaigns to raise public awareness of the dangers of global warming and calls for immediate action to curb its destructive effects on the environment.