If you knew you were to die as a species and you were as flawed, unwell prepared and selfish as humans are.. you may try this.
Send a huge nuclear bomb first, followed by a space ark with people on it. Send these up into space and towards the best bet planet to live upon. This could be as local as Mars to Earth or much much further away a planet and towards what we now call Earth.
The bomb would strike the planet first and kill all who may live there (dinosaurs) and the space ark would arrive much later with the soon to be cave men.
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