What do you think about the following information about human extinction?

The warming after the Last Glacial Maximum was interrupted by an event called the Younger Dryas, an extreme thousand-year chill that caused the Holocene Extinction Ecent, when all the megafauna like mammoths became extinct. Mankind also almost died out. A charred sediment layer at many sites that includes nanodiamonds, iridium, charcoal, and magnetic spherules is consistent with a major cometary strike at that time. The airburst explosion of a carbonaceous chondrite comet could have caused the major extinction about 12,000 years ago.