| 1 | They are greenhouse gases. | |
| 2 | In this respect, clouds are like greenhouse gases. | |
| 3 | And these greenhouse gases perturb the radiation balance of climate. | |
| 4 | A fiery steed is not trained in a courtyard, nor does a pine grow sturdy in a greenhouse. | |
| 5 | Our greenhouse is nothing compared with yours. |
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