If you could change one thing about this world, what would it be and why?

Assuming I could change just one thing in this world, it would be for all of humankind to develop greater empathy and selflessness. I do believe it could be the start of so much good at all levels - it would help nations, societies and people to focus on their own and others' happiness --- and make decisions that focus on the larger good. Many of the troubles ailing us as nations would disappear if we just saw the other side and put ourselves in their shoes. Societies would heal if artificially created differences were done away with. And families and relationships would benefit from a better understanding of the other side's point of view. 

In this utopian world filled with empathy and selflessness, no human would die of hunger, no mother would lose her child due to lack of medical facilities and no human would die of self harm because they were not "normal" or a part of the mainstream.

What saddens me, however, is that this is such an easy thing for everyone to do. If we all just did 1 (or 10) good deed a day, this world would be a better place already. The miracle isn't anywhere else, it is within us.