This song is about love and worldly conflicts in every subtle kind of way. Simple as.
Its basically saying how no matter what you do in life, make it for the greater good. Make it so there is only a happy ending. "love or light or heat whatever". Happiness lies in simplicity, and understainding one another instead of remprimanding people from the past until today. That's why it asks are you starting to change? To make this world a better place! Its love and peace all the way.