Here's a simplistic scenario: A giant meteor hits earth, causing it to change position slightly in space, making UV radiation much more intense. As a result, every person with anything but very dark skin dies of skin cancer.
Sudden catastrophic environmental changes happen all the time.
Sudden catastrophic environmental changes happen all the time.
If The Flintstones have taught us anything, it's that pelicans can be used to mix cement.
-Homer Simpson
-Homer Simpson