Nedenfor graf er hentet fra NASA sin nettside. Det er rimelig sterk konsensus med at sol aktiviteten den siste tiden ikke
Nedenfor er utdrag hvor de forklarer årsak til at sol aktivitet ikke kan forklare nåværende oppvarming.
The amount of solar energy received by the Earth has followed the Sun’s natural 11-year cycle of small ups and downs with no net increase since the 1950s. Over the same period, global temperature has risen markedly. It is therefore extremely unlikely that the Sun has caused the observed global temperature warming trend over the past half-century.
It’s reasonable to assume that changes in the Sun’s energy output would cause the climate to change, since the Sun is the fundamental source of energy that drives our climate system.
Indeed, studies show that solar variability has played a role in past climate changes. For example, a decrease in solar activity coupled with an increase in volcanic activity is thought to have helped trigger the Little Ice Age between approximately 1650 and 1850, when Greenland cooled from 1410 to the 1720s and glaciers advanced in the Alps.
But several lines of evidence show that current global warming cannot be explained by changes in energy from the Sun:
** Since 1750, the average amount of energy coming from the Sun either remained constant or increased slightly.*
** If the warming were caused by a more active Sun, then scientists would expect to see warmer temperatures in all layers of the atmosphere. Instead, they have observed a cooling in the upper atmosphere, and a warming at the surface and in the lower parts of the atmosphere. That’s because greenhouse gases are trapping heat in the lower atmosphere.*
** Climate models that include solar irradiance changes can’t reproduce the observed temperature trend over the past century or more without including a rise in greenhouse gases.*
https://climate.nasa.gov/internal_resources/1802/