| constitute the bulk of … | 0.52 |
| accumulated into hydroc… | 0.44 |
| reach consumer | 0.16 |
| take 10 minutes | 0.16 |
| react with sunlight | 0.16 |
| two carbon atoms | 0.25 |
| colorless, odorless gas | 0.33 |
| a greenhouse gas | 0.24 |
| separated | 0.68 |
| used as feedstock | 0.61 |
| produced | 0.58 |
| converted to ethylene | 0.52 |
| recovered | 0.49 |
| cracked | 0.44 |
| isolated on industrial … | 0.39 |
| separated by fractionat… | 0.25 |
| left in the gas stream | 0.25 |
| degraded in the absence… | 0.25 |
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