On the basis of the calculations performed on the basis of the PFO-CFO Theory, we arrived at the conclusion that all widely-discussed mass extinctions were caused by quite definite solar events. There were no principal changes in nature after the series of the past extinctions, and, thus, it can be expected that the events that occurred multiply in the past, will occur hereafter. Do you think that people should prepare the ways for minimization of possible future harmful effects of solar phenomena?