| http://www.w3.org/ns/prov#value | - Ice core data show that the atmospheric concentration of N2O varied by less than about 10 ppb for 11,500 years before the onset of the industrial period. {2.3, 6.4, 6.5} The increase in N2O since the pre-industrial era now contributes a radiative forcing of +0.16 ?? 0.02 W m???2 and is due primarily to human activities, particularly agriculture and associated land use change.
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