Some are. Others will have to be willing to fight their destructive desires in order to obtain it.
Absolutely. Look how far we've come already. If you talked to someone in the Middle Ages or earlier do you think they wouldve thought we'd achieve what we have achieved?
Absolutely. The environment conditions individuals to act certain ways to survive. Our current environment encourages unnecessary greed to raise the conditions of those who act on their greed, at the expense of humanity as a whole.
Depends on your definition of peace. If you mean "no more wars" then yes, it is possible. If you mean "no more conflict" then the answer is no.
Violence, anger, and greed are natural human instincts; they are animal instincts as well. This is why the idea of "World Peace" is exactly that...an idea. There have been countless studies done showing Violence, anger, and greed are as basic as animals. Even cute little puppy dogs fight each other from birth; not just for play but also to get a spot on their mom's undercarriage for food. If needed, they will kill each other or maim each other to get THEIR spot. The universe and life are about survival, there's only one way to survive...be the last one standing. It's a fact of life people; wish and debate it away all you want but it's a law of the universe. Imagine this, we get world peace, the world starts booming, helping each other exist, suddenly the population outgrows the supply of food, water, space, etc. What do you think will happen? Do you really think we will diplomatically decide how to kill off enough people to keep humanity afloat?