Well a world government isn't absolutly needed, but there needs to be a way for the world to adress its problems. Such as poverty and disease. We already have the UN, but it's simply not good enough to fufull our needs. What I see happening is that power centeralizes in the West and the leaders of the world will most likley be the US and the EU. People say China would also end up in a position of power, but anyone who's seen the situation in China knows that they have a long way to go before they have the same cultural, social and economic impact on the world as the United States does. Their military might match ours soon, but that's the only way they'll be able to stand eye to eye with us. So look to the West to lead the world into a Type 1 civilization.