Economist Alan Barreca of Tulane University thinks Global Warming is going to shut down sex.
Barreca says, "In the United States and Europe, there's actually a pretty big spike in births in the summer months, and if you go back nine months that implies that conceptions are most likely to occur in the colder winter months."
So by extension Barreca concludes, "According to a state of the art global circulation model [aka Climate Change], there is going to be about 90 hot days per year [60 more than today]...we project that the number of births will fall by about 107,000 per year in the United States by the end of the 21st century."
So there you have it - due to an abhorrence to sweaty sex, mankind will finally peter out and die off. The ultimate doomsday scenario!