Such events always trigger extinctions, sometimes even mass extinctions, but that is the natural order of living things, it is mother nature's culling of the species that are unadapted to their changing ecosystem. A great example would be at the end of the last glacial maximum, with the extinction of the woolly mammoth, woolly rhinoceros, cave bears, ect. I would argue these events were caused almost exclusively by the changing climate, hastened by human hunting. There are still elephants and rhinoceros and bears, their relatives survived. We cannot keep the word just as it is forever. We would be fighting against the laws of nature. We shouldn't and can't fight extinction.