That skit symbolizes unity and a shared planet, which is shown by all these people of different ages, races, colours, cultures, languages, etc, who come together and dance in that skit.
The dance movements are inspired and driven also by African-American Spirituality.
The globe that is passed from one person to another symbolizes shared interests in the planet, and also the notion that one generation should pass the planet in good condition to the next generation.
The little, black African kid that is brought in front of him (at the end of that skit) symbolizes also the singer's African roots.
At the very end of the performance, Michael Jackson wants to get across a sense of hope and protection, that is why Angela Ice as an angel flies down and covers him with her wings.