 |
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| q |
Detection and attribution studies consistently find evidence
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|
for an anthropogenic signal in the climate record of the last
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35
to 50 years.
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|
| q |
Simulations of the response to natural forcings alone (i.e.,
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|
the response to variability in solar irradiance and volcanic
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eruptions) do not explain the warming in the second half of
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|
the 20th century.
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| q |
However, they indicate that natural forcings may have
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|
contributed to the observed warming in the first half of the
|
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|
20th
century.
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| q |
Most of the observed warming over the last 50 years is
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|
likely to have been due to the increase in greenhouse gas
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|
concentrations.
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