求一篇英语演讲稿，标题为30年后，要求没有语法错误！

Thirty years from today, what will happen? Nobody knows. But we can always predict. It takes a year for the world economy to enter recession, it took six years for World War II to end, so what changes will thirty years bring?

I believe that thirty years later, the economy will rise to prosperity once again. But instead of having the United States of America being the dominant economic world power, China will be the dominant power. China, with a great leader and loyal people, will step onto the world stage and lead the world into a new century.

I believe that thirty years later, humankind will depend on technology even more. That the term 'train' will fully disappear, and 'airplane' will be heard more than 'car'. And I belive that instead of dominantly using electricity, we will be using solar power. That there will be no more electriity generator, but find solar panels everywhere.

I believe that thirty years later, there will be no more global warming. Earth will once again become healthy and we will care for it in every way we can. There will be no more endangered animals and no more captivity of animals.

I believe that thirty years later, there will no longer be war. That instead of having hundreds of countries, we will have one, and everyone will live happily and peacefully together.

I believe that thirty years later, 'the world' will have a diffeent meaning. Every mankind will be in peace and live among one another, without war or disputes.