1) That every person on the planet would suddenly be bestowed with empathic powers.
2)That those empathic powers were so tuned as that everyone had a range of up to range of some great distance (say 100 miles...haven't thought about that one yet), and could not turn it off or limit it to any number of persons.
AND HERE'S THE KICKER:
3)That every time a child who walks anywhere on this planet was abused ,starving, or killed; their pain would be empathically (not empathetically) felt ten fold, by every single last adult on the planet.
I think that the human race would very quickly start to change their perspective of things and that the world would soon become a very different place.