evidence: A comprehensive review of published scientific research by the Intergovernmental Panel on Climate Change concluded that, averaged over the solar cycle, the best estimate of the Sun’s brightness change between the pre-industrial period and the present (2019) is 0.06 Watts per square meter. That increase could be responsible for about 0.01 degrees Celsius—around 1 percent—of the warming the planet has experienced over the industrial era (0.95–1.2 degrees Celsius in 2011–2020 versus 1850–1900). [...] Taken together, the increasing solar activity of the first half of the 20th century and the decreasing activity since then have largely canceled each other out in terms of their influence on global temperature. In the Sixth Assessment Report from the Intergovernmental Panel on Climate Change, experts concluded that the best estimate for the influence of the Sun on climate between the pre-industrial (1850-1900) and the present (2010-2019) was that it added 0.01 Watts per square meter to the global energy imbalance causing global warming. Such a small energy imbalance (scientists call it a radiative forcing) is likely to be responsible for no more than 0.01 degrees Celsius of warming over that period. That’s 100 times smaller than the overall warming that’s occurred on Earth over the industrial period, which the IPCC estimates as 0.95–1.2 degrees Celsius in 2011–2020 versus 1850–1900.