Remember reading a Sci Fi story about a bioengineered bacteria to clean oil spills getting out into the environment and mutating and destroying civilization because it eats all the gasoline and diesel fuel, degrades lubricants.....
That sounds like Vonnegut’s Ice 9, that froze all the earth’s water.
My dad often says that the U.S. military needs to develop a new biological weapon to deploy in the middle east that turns crude oil into sand.