World Peace!

What are some outthere type conditions needed for the world to be as one and everybody could live happily?

Here are some i've thought of:
-An end of trade (and in the process "greed" entirely)
-Solve world hunger
-Agreement of religion
-Agreement of morals, yet completely open to new morals that may develope

Basically, i've watched Star Trek TNG and I like how they've done it.

discuss

Collectivism of a classless society characterized by the collective ownership of property and by the organization of labor for the common advantage of all members, ruled by a government in which the state plans and controls the economy and a single party holds power, making progress toward a higher social order in which all goods are equally shared by the people.  The proletariat must work to overthrow the bourgeoisie.