Why is the greenhouse effect only one way?

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So what I’m reading is that these gas absorb the light from the sun and keeps it trapped on the earth.

What I don’t get is how is it letting the light and heat in from the sun in, but not the light and heat reflected from the Earth out? If it’s a barrier, shouldn’t it block both ways? If it’s not a barrier, how is it trapping the heat?

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Anonymous 0 Comments

It’s not letting heat in, only visible light (mostly). That gets converted into infrared light (heat) by the ground, which cannot pass back through the greenhouse gases because of their properties.

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