Time

Earth is 4.5 billion years old.
Life has existed for the last 3.4 billion years.
It is predicted the last animals will disappear in less than half a billion years from now. Life (diversity) on Earth is already in decline.

If 4.5 billion years was a 24-hour clock, then:

  • Complex life (Cambrian) doesn’t start until 22:00 hrs.
  • Dinosaurs start at 23:00 hrs.
  • – And Homo Sapiens have existed for 2 seconds.

Or

If 4.5 billion years was a mountain as high as Everest.  My life is the height of the last snowflake at the top of the summit.

(From The Life And Death of Planet Earth. Peter Ward & Donald Brownlee.)

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