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Methane (US: / ˈ m ɛ θ eɪ n / METH-ayn, UK: / ˈ m iː θ eɪ n / MEE-thayn) is a chemical compound with the chemical formula CH 4 (one carbon atom bonded to four hydrogen atoms). It is a group-14 hydride, the simplest alkane, and the main constituent of natural gas.
[14] [53] The globally averaged concentration of methane in Earth's atmosphere increased by about 150% from 722 ± 25 ppb in 1750 to 1803.1 ± 0.6 ppb in 2011. [ 54 ] [ 55 ] As of 2016, methane contributed radiative forcing of 0.62 ± 14% Wm −2 , [ 13 ] or about 20% of the total radiative forcing from all of the long-lived and globally mixed ...
An adjective (abbreviated adj.) is a word that describes or defines a noun or noun phrase.Its semantic role is to change information given by the noun. Traditionally, adjectives are considered one of the main parts of speech of the English language, although historically they were classed together with nouns. [1]