Can the world live in peace? What must be done in-other to achieve peace on earth?

How does culture influence the behaviour of people especially when it comes to inter-ethnic/inter-cultural marriages?

As long as there is a limited number of something there will not be peace because someone will always be willing to resort to violence to make sure they get their fair share and because no one is equal you can't divide something so that everyone feels that it is fair. It is in our nature.

Ancient Europeans wrote about Ages of Man:

http://en.wikipedia.org/wiki/Ages_of_Man

There are also many other references to various
Types of world ages or Ages of Man in Hopi
(worlds), Mayan (suns) and other cultures of
Antiquity. Giorgio de Santillana, the former
Professsor of the history of science, mentions
Approximately thirty ancient cultures that
Believed in the concept of a series of ages and
The rise and fall of history, with alternating
Dark and Golden Ages.

More details about ages if available in the Yuga concept
Of the Hindus:

http://en.wikipedia.org/wiki/Yuga
http://en.wikipedia.org/wiki/Satya_Yuga

There will be highest peace in Kritha Yuga and there will
Be no wars. Evil spreads gradually as the ages pass.
The present age is Kali Yuga - age of darkness.

However, there is hope. Hindu astrologers wrote that
Crime rate in the world will be reduced to 40% of
Its present level in about two decades from now:

"From 2010, winds of spiritualism will blow across the
entire world, awakening more and more people in its wake.
Where limits of (modern) science end, spiritualism begins.
.... Along with scientific progress, intellectuals will start
recognizing the importance of spiritualism. ....
From 2050, a new era will begin...."

Swami Dattavadhut, Prophecies 1998 to 2100, Vanita Books,
Mumbai, 1997, pp. 33-42.

I hate saying it but it is more then likely that there will never be peace on Earth. Reasoning: people are greedy... humans want, and the more they get the more they want.
Of course we can still try to achieve peace on Earth, but the way I see it is, someone is going to try to take more then their fair share and that will begin a brawl and in the end we will all suffer greatly. More so then now.