National Academies of Sciences, Engineering, and Medicine. 2016.
Frontiers in Decadal Climate Variability: Proceedings of a Workshop. Washington, DC:
National Academies Press. DOI: 10.17226/23552.
"Many
factors contribute to variability in Earth’s climate on a range of timescales,
from seasons to decades. Natural climate variability arises from two different
sources: (1) internal variability from interactions among components of the
climate system, for example, between the ocean and the atmosphere, and (2)
natural external forcings, such as variations in the amount of radiation from
the Sun. External forcings on the climate system also arise from some human
activities, such as the emission of greenhouse gases (GHGs) and aerosols. The
climate that we experience is a combination of all of these factors."
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