If human cloning happened
The Economist

And after he had wept for Enkidu, Gilgamesh slept again and in his dream his passion woke up. Cloning?, he dreamt. Cloning alone pales before the possibilities. Combined with genomic analysis and manipulation that are now possible, cloning can become the tool of creating the next human species. Or, even better, multiple species. People with wings for the angel obsessed, or people with gills for the diving enthusiasts, or people adapted to space travel and survival on other planets with minimal protection and equipment. Not to speak of appearance, performance or sexual modifications. Populate earth with all our dreams of those intelligent aliens from other planets. Are we not such stuff as dreams are made on? Are we slaves to Humbaba?