| the atmosphere | 0.62 |
| the air | 0.49 |
| contribute to climate c… | 0.63 |
| build up in the atmosph… | 0.59 |
| remain in the atmosphere | 0.58 |
| go into the atmosphere | 0.58 |
| enter the bloodstream | 0.56 |
| dissolve in water | 0.56 |
| burn fossil fuels | 0.54 |
| occur in the atmosphere | 0.53 |
| react with water | 0.52 |
| cause global warming | 0.51 |
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| dizziness | 0.40 |
| expansion of the batter | 0.37 |
| ocean acidification | 0.33 |
| 9–26% | 0.30 |
| headache | 0.27 |
| 3–7% | 0.26 |
| nausea | 0.21 |
| asphyxiation | 0.19 |
| drought | 0.16 |
| cooling | 0.16 |
| a gwp of 1 | 0.25 |
| major impact | 0.41 |
| a lifetime of a century | 0.34 |
| higher density | 0.27 |
| surfactant | 0.25 |
| little effect | 0.23 |
| negative impact | 0.16 |
| a suite of chemical cha… | 0.29 |
| death | 0.23 |
| unconsciousness | 0.16 |
| gas | 0.67 |
| a greenhouse gas | 0.61 |
| heavier than air | 0.43 |
| colorless, odorless gas | 0.43 |
| a chemical compound | 0.41 |
| primary greenhouse gas | 0.41 |
| denser than air | 0.38 |
| a trace gas | 0.38 |
| major greenhouse gas | 0.37 |
| occurring gas | 0.35 |
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| released | 0.74 |
| captured | 0.68 |
| removed | 0.67 |
| emitted | 0.65 |
| added to the atmosphere | 0.64 |
| stored | 0.64 |
| emitted by human activi… | 0.63 |
| produced by human | 0.62 |
| absorbed by tree | 0.61 |
| obtained | 0.61 |
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