What is the most significant challenge to international peace and security facing the world over the next deca
363150
The battle for water rights.
177552
The most ominous problem that will affect the US easily in the next 5 or 10 years will be the overpopulation of such countries as Red China, India, Pakistan, Indonesia, etc, along with the declining fortunes of the US and Europe.\nRed China has been quietly sabotaging and infiltrating the US since they killed JFK for starters, and are now openly getting military about it all.  They are behind the "Terrorists" and most of the troubles we face across the world today.  Just think, the world's population is suppossed to be DOUBLED by 2012, and yet Red China will run out of food and energy sources for their own people alone in 2010, or so, I have heard on TV.  The only good news is that such may catch up to them before they can invade Taiwan, Japan, Hawaii, California, etc.
1158182
First it is freedom.  True freedom, personal, religious, and political is the solution. With out that your country will continue as it is forrever.  No amount of international help (food, money, pats on the back) will help. Those things only keep those in power stay in power.
638207
None.\n\nThe five Nuclear Powers.\n\nThe World should stop at 5 Nuclear Powers.\n\nThe nukes may never go away.\n\nBut it helps to know there has not been a single nuclear attack against any country since Nagasaki 1945. That is more than 60 years ago.It would be safe to keep it that way.\n\nCan anyone guarantee the same if other countries(ANY) start developing nuclear weapons indiscriminately?
399045
Nobody is willing to face a war.  We have so many treaties and organisations to nib it in budding stage itself.  Every nation wants to champion the cause of peace and many nations oppose the move to breach of peace.  The reason is  the big nations and developed nations will suffer great loss of life, man power, money, material, projects, food supply ,transport, communications etc. There will be no world or war thereafter.
985400
The brain.  The biggest challenge for humans is the mental causes for physical illness and disease.\n\nPeace!
1103390
The biggest threat to humanity is inhumanity. But picking from your list I'd say viruses top the list of recurring real threats. For the more theoretical ones I'd say most catastrophic: 1) invasion by unfriendly aliens 2) meteors 3) advanced AI. Most likely: 1) advanced AI 2) meteors 3) alien invasion. Not too concerned about warfare, we've had a long history of dealing with that. Also not too concerned about climate change, we can come up with technology to deal with that.
253954
world will say more than ONE WORD: \n\nGO AHEAD!
1182581
Basicly, humans. We want everything, we want to have it our way, don't like to comprimise, and become socalised in to ideologies that serve to reinforce values and beliefs, that become outdated quickly in an increasingly globalised world. We want things easy, and don't like to take the diffifcult but necessary steps to ensure long term peace or survival. If your talking about concepts, then Id say religion, land and money are the main causes of international tensions.
117756
World peace from Iraq?  Are you serious?  If achieving world peace was that easy... well... it isn't.
830983
The 21st century sadly will be a war-zone.\n\nTerrorists are everywhere, and nuclear weapons continue to spread to 3rd world nations. Put the two together and its a recipe for disaster.\n\nLike most people, I long for peace. But I don't see it happening. Hopefully, we all learn from the past, and trust in God and diplomacy.
300980
1.world.\n2.war.\n3 .three.
218736
The first strep is lasting security. Nobody is going to build a factory that's going to get blown up the day it's finished. Security is the major obstacle in securing peace.  Greed, corruption and ignorance have taken hold.\n\nI believe creep can work both ways. A stable nation surronded by corruption will become corrupt and vise versa.  I break down countries as haves (western Europe, Canada, The U.S., Japan, Australia), almost haves (like China, India, South Korea, Mexico, Eastern Europe and Brazil) and the not haves (like most of Africa and southern Asia).  I believe if we concentrate on turning the almost haves into haves, it will be much easier to turn the have nots into haves.  Look at Iraq. We will be spending nearly $1 trillion by the time we are done with Iraq and that might all go down the drain when we leave.  Giving $1 trillion to Central America would probably turn those countries into "haves" in less time with much more guarantee of success.  \n\nI'm guessing it will take maybe $7 trillion to turn all of Latin America into "haves" without all the deaths. While it will probably take $20 trillion to do the same for Africa and with several dead. Once we turn the almost haves into haves we can tackle the problem with the not haves, because we will have more help with money and manpower.  If we start with the not haves first, nobody is going to be helped.
150330
Predicting the future is tough for mere mortals.  I'm going to guess that there will be a 3rd world war and that it will be quick and world ending.  Jury is still out on the whens and hows.
283078
Isuues to be dealt with:\n#1 Leaving too soon will leave a power vacuum that will be filled with those who we will be fighting in the future.\n#2 The United States is easy to blame for every poor man's woes and those that would have power over others use it to their advantage.\n#3 There are significant cultural differences between MiddleEastern and Western nations that are/will be very very hard to resolve.\n#4 Isreal.\n\nThe answer?  Pour as much money as possible into space development, exploration, and colonization so we can escape this ever-shrinking planet and have the vacuum of space as a bufferzone like the oceans used to be.
315634
Definitely world peace, because if wars keep getting worse and worse someone's gonna "push the button," the world as we know it will end, and being wealthy would not enable anyone to do anything about it.
1018885
Outcome 1:\nNo, the world will end before then, especially if North Korea/Iran don't stop it with their nuclear programs.\n\nOutcome 2:\nNow that computers have become such a large part of our lives, I don't see us ever not using them.  They will become much more advanced and the way that we interact with them will change dramatically.\n\nOutcome 3:\nWe will develop computers that become too powerful and we will live in a world much like the Matrix (maybe we already do ;) ).  Come to think of it, what if in the Matrix, people built computers inside the Matrix and these computers made another Matrix, like a Matrix inside a Matrix.  You could call the second one Matrix Jr.