Your second link states right at the start, &quot;There is, however, a dawning realization among researchers that even these apparently tiny variations can have a significant effect on terrestrial climate.&quot;  And there&#x27;s uncertainty and debate between scientists mentioned throughout.<p>The sun inputs many orders of magnitude more energy as humans into the atmosphere.  Even 0.01% variability in solar output should create fluctuations in surface temperatures that we can measure.