The word Ubuntu is a Nguni word that has no specific translation to english, but is used to describe an African view of life where humans can only get a full fulfilment in life by interacting with other people. This represents a a human spirt that unites mankind across race and religion boundaries.
To me, Ubuntu means that a human will not die happy or satisfied unless they interact with people outside of their comfort zone. It has a hidden meaning in my mind that tells you to help the homeless man on the street, attend a religious service that will help you understand other people's opinions, or give that extra 3 dollars to the pizza man. Despite other arguments, no one wants to be alone. Doing something which requires you to step out of your small comfort box could help you make the lifetime connections with people that help you escape loneliness.
This relates to the Rifkin RSA video perfectly. The video told us how we needed to forget about everything society has made up, (politics, religion, social ladders, etc.) and come together as a human race if we want to survive. Ubuntu is essentially telling us the same thing, only comparing it to a person's happiness. I think the human race can survive if we adapt a portion of both philosophies. Getting rid of the "made up" portions of society will not fix everything because we are human, and we are flawed. Everyone needs to help everyone if we want to survive.
Of course, all of this carries back to our essential questions of our Hope/Human Spirit Unit. It falls under the ever-growing category of loneliness and how a human expresses hope when they are lonely. Hopefully a lonely person in the world will understand this, and start a new generation of hope that is planted in your brain the day you are born.