[RonBee]

Originally Posted by Joe

Dear Teachers, I am going to delivering a speech to an audience of 200.

Say either "I am going to be delivering a speech" or "I am going to deliver a speech". (I prefer the latter.)

Originally Posted by Joe

Good evening, ladies and gentlemen, let me begin my speech with some simple calculation.

Try:

• Good evening, ladies and gentlemen. Let me begin my speech with a simple calculation.

Originally Posted by Joe

Suppose we—all of 25,000 students in this University—use single-use chopsticks every day. If a chopstick is about 20cm3, we will consume 500 m3 of wood just by using this single-use item. That is about 10,000 trees with an average height of 5m and an average diameter of 10cm.

That's good. :)

Originally Posted by Joe

Let’s also pretend that we plant a single tree every 3m, then more 100,000 m2 of forest are disappearing every year just because people in one college use single-use chopsticks in their three meals every day.

That doesn't work. Trees take up space. You need to say "one tree every square meter" or "one tree every two square meters" or something like that. Also, instead of "in their three meals every day" say "three times a day".

Originally Posted by Joe

My dear friends, what a big challenge we are facing in environmental problems.

That's not bad, but try:

• My dear friends, we have a big environmental problem on our hands.

Originally Posted by Joe

For our Chinese, there is no more pressing issue than environmental protection.

How about:

• For this generation, there is no more pressing issue than protection of the environment.

Or:

• For this generation of Chinese, there is no more pressing issue than protection of the environment.

Originally Posted by Joe

We have been making a big step ahead for economic growth but an even bigger step back for environmental protection.

• We have taken a big step forward for economic growth, but we have taken an even bigger step backward for environmental protection.

Originally Posted by Joe

None of us would ever obliterate the memory of the 1998 flood, nor would we forget the millions of refugees with their homes destroyed in a flash.

• None of us will ever forget the 1998 flood, nor will we forget that millions of people had their homes destroyed in a flash.

(It wasn't the refugees that had their homes destroyed. It was getting their homes destroyed that made those people refugees.)

Originally Posted by Joe

My dear friends, you must remember the SARS epidemic last year, an infectious disease threatened every single individual in this country.

The first part of that is good, but you could do it better.

Originally Posted by Joe

I don’t think anyone could state that it had nothing to do with what we have done to nature and keep a straight face at the same time.

Rework that, takng out the part about the straight face.