On the other hand, the ensemble mean in NAT showed a positive trend, indicating that the observed negative trend may not be explained without considering anthropogenic forcing.
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Contributions of natural and anthropogenic radiative forcing to mass loss of Northern Hemisphere mountain glaciers and quantifying their uncertainties.
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The sentences
The area-weighted average of global mass changes in observations and the ALL experiment showed a negative trend, in particular after the 1980s ( Fig. 3 ).