Aliens are interbreeding with humans to create a hybrid species that will save the planet from annihilation by climate change, an Oxford professor has claimed.
Young-hae Chi, an instructor in Korean at Oxford's Oriental Institute, said the human-alien hybrids may already be walking among us.
After first making the claims in a lecture several years ago, Dr Chi has now written a book on the subject.
His proposal to debate the subject at the Oxford Union was rejected last year, the Oxford Student newspaper reported.
In his lecture, titled Alien Abduction and the Environmental Crisis, he outlined his theory concerning the presence of aliens on Earth.
He believes in a correlation between alien abductions and climate change.
Dr Chi said it was 'not only scientists and theologians, but also non-human species who appear to be greatly concerned about the survivability of the human species.'
Reversing climate change now would not only save the world but would also prove to aliens that their low estimation of humans' moral capacity was wrong, he said.
He added: 'It may be more or less assumed that the hybrid project is a response to this impending demise of human civilisation.'
His new book, which is written in Korean, is called Alien Visitations and the End of Humanity.
There are four types of aliens: small; tall and bold; scaly with snake eyes; and insect-like, Dr Chi said.
The insect aliens give orders to the lower ranks and exist in a comprehensive system that humans cannot experience because our organs limit our perception.
Despite saying that he was still looking for more evidence to support his view, Dr Chi suggested that the alien-human hybrids were of high intelligence and so could be the problem solvers of the future.