1.Supervolcano under Yellowstone
2.People can be silent carriers for mad cow disease
3.Prions
4.Superbugs that are antibiotic resistant
5.A bacteria almost wiped out plant life
6.Nuclear waste on The Marshall Islands
7.Fewer insects = big problems
8.Barrier Reef will disappear
9.Half of human population have cancer
10.Betelgeuse will explode soon
