Grey Goo
One potential scenario that has been envisioned is out-of-control self-replicating molecular assemblers in the form of grey goo which consumes carbon to continue its replication. If unchecked such mechanical replication could potentially consume whole ecoregions or the whole Earth (ecophagy), or it could simply outcompete natural lifeforms for necessary resources such as carbon, ATP, or UV light (which some nanomotor examples run on). It is worth noting that the ecophagy and 'grey goo' scenarios, like synthetic molecular assemblers, are based upon still-theoretical technologies that have not yet been demonstrated experimentally.
Read more about this topic: Molecular Assembler
Famous quotes containing the words grey and/or goo:
“There is grey in your hair.
Young men no longer suddenly catch their breath
When you are passing;
But maybe some old gaffer mutters a blessing
Because it was your prayer
Recovered him upon the bed of death.”
—William Butler Yeats (1865–1939)
“You with the goo on the suction cup.
You with your wires and electrodes
fastened at my ankle and wrist,
sucking up the biological breast.”
—Anne Sexton (1928–1974)