Assertion: methane's effect | /r/HasProperty | large
Facets:
Source sentences:
text: Methane has a large effect but for a relatively brief period, having an estimated mean half-life of 9.1 years in the atmosphere, whereas carbon dioxide is currently given an estimated mean lifetime of over 100 years.
text: Methane has a large effect for a brief period (about 10 years), whereas carbon dioxide has a small effect for a long period (over 100 years).