The Christian afterlife, when lions can be petted by humans while sitting
next to a lamb, without
fear of getting mauled. Since humans are of the animal kingdom, they will behave
good too.
In the age of
well-behaving animals, no strain of bacteria would not make us sick, and elephants wouldn't trample
children.
In the age of well-behaving animals, no
one would bother going to war or steal from someone.