Published 03.09.2020 Since 1978, a number of satellite instruments have directly measured the energy emitted by the Sun. Satellite data show a very small decrease in solar radiation over this time period. Thus, it is obvious that the Sun is not responsible for the warming trend observed in the last few decades.
Graph provided by: NASA's Jet Propulsion Laboratory, a leading center for automated solar system research
The graph above compares global changes in surface temperature (red line) and the solar energy that the Earth receives (yellow line) in watts (units of energy) per square meter since 1880. The thinner lines show annual levels, and the thicker ones show 11-year moving averages. Eleven-year averages are used to reduce the interannual natural noise in the data, making the main trends more obvious.
The amount of solar energy that the Earth receives corresponds to the natural 11-year cycle of the Sun, consisting of small rises and falls, without any obvious increase since the 1950s. Over the same period, the global temperature has increased markedly. Therefore, it is extremely unlikely that the Sun has caused the observed warming trend in global temperatures over the past half century.
Prepared according to the materials https://climate.nasa.gov/causes/