B: Not well at all. Over the last few weeks the hot, humid weather is killing me. I believe the climate has changed.
A: Yeah, the summer is hotter, and winter wetter.
B: Do you know why all this has happened?
A: The greenhouse effects bring global warming and rain.
B: What do you mean by greenhouse effects?
A: The earth is now like a real greenhouse made of glass panels that let light in and trap heat. You know, carbon monoxide from earth is a greenhouse gas.
B: I see. Everybody should know what cause global warming; otherwise we won’t stop it.
A: The important thing is that human beings should take steps to reduce global warming.
B: What can we do then? Perhaps we should not burn any more wood or coal.
A: Right. Also we should try to produce less CFCs or Freon.
B: How can we achieve that?
A: Don’t use aerosol spray on your hair, and depend less on air-conditioners and refrigerators..
B: But it’s hard to give up all this.
A: But we must take action before polar icecaps melt and oceans rise.
