Original sentence: Approximations to solar forcing employed in most global circulation models (GCM's) do not produce a significant component of 20th century climate change.More recent analysis indicates solar forcing may have been a prominent, even dominant component of climate change during the industrial era and that the modeling of solar forcing in GCM's underestimates the solar contribution to climate change.National Research Council study,  and to contribute to global warming during the industrial era.Opinions are divided on the relative significance of natural (solar) and anthropogenic (GHG) forcing of climate change and are likely to remain so pending further observations of forcing phenomena and analyses of corresponding climate change.Variations in total solar irradiance (TSI) were found to be the likely cause of past climate change according to a U
Edited sentence: The meteorological community has responded with skepticism, in part because theories of this nature have come and gone over the course of the 20th century.The most accepted influence of solar variation on the climate is through direct radiative forcing, but this is too small to explain significant temperature change.There have been proposals that variations in solar output explain past climate change and contribute to global warming.Various hypotheses have been proposed to explain the apparent solar correlation with temperatures that some assert appear to be stronger than can be explained by direct irradiation and the first order positive feedbacks to increases in solar activity