Direction: Write a composition of at least 250 words on the given topic "My idea of the future world" with the following outline. Present your argument with supporting details.
1. 悲观者看到的是战争、污染、恐怖分子的袭击、非典、艾滋病……
2．乐观者看到的是光明灿烂的世界……
3．我的看法……