Does the fact it happened in the past mean it will happen again?
Absolutely – because many threats are cyclical in nature: Asteroid strikes, rise of poisonous atmospheric gases such as methane, geological upheavals such as super-volcanic detonations, ice ages and other radical climate changes are all events that occur in cycles.
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ReplyDeleteExtinction of one life form to make room for the next is the way life has evolved on Earth. For instance, the dinosaurs’ extinction made possible the emergence and eventual domination of mammals . . . none of which is all that comforting if its our own species that is facing extermination.
ReplyDeleteYes, because it’s happened before. Science has identified 20 times during which earthly life has faced a “mass extinction event” caused by a natural phenomena. On some occasions over 90 percent of the life forms on the planet was wiped out.
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