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Don't knock it 'til you've tried itsometimes it's the simplest of things that are definitely the most fun!The "Greenhouse Effect" A greenhouse is a building made of glass that allows sunlight to enter but traps heat inside, so the building stays warm even when it's cold outside Because gases in the Earth's atmosphere also let in light but trap heat, many people call this phenomenon the "greenhouse effect"Greenhouse effect eniscuola energy&environment Esrl Global Monitoring Laboratory Education And Outreach Greenhouse effect drawing for kids