Not until fifty years later did scientists surmise that the high temperatures back then might have been caused by increases in the sun's radiation due to changes in sunspot activity.
五十年後，有學者提出，當年久旱是因為太陽黑子（太陽表面的黑色大斑點）的活動由旺盛轉為安靜，造成太陽輻射熱量增加，地球表面溫度升高的緣故。聖嬰在作怪？