Speaking exclusively to BBC News at the British Association
Science Festival, Dr Bernard Foing said that the ark should be a
repository for the DNA of every single species of plant and
animal.
Dr Foing is head of Europe's Moon missions, so his thoughts
on matters lunar should be taken seriously.
He is concerned that if the Earth were destroyed, there would
be little or nothing left of the rich diversity of life on the
planet.
His solution is to build a DNA library on the Moon.
"If there were a catastrophic collision on Earth or a
nuclear war you could place some samples of Earth's biosphere,
including humans, [on the Moon]," he said.
"You could repopulate the Earth afterwards like a Noah's
Ark," he said.
For the time being though, Dr Foing is awaiting the arrival
of Europe's first probe to the Moon.
That mission is due to arrive ahead of schedule in November.
It is the first of what he hopes will be a fleet of robotic
spacecraft sent to the Moon.
They would be used to build a lunar colony.