* Give their names.
* Tell what they do.
* Explain how this affects the planet.
* Explain where they come from naturally.
* Explain where the extra gases have been coming from in the
past 250 years.
* Explain how this is dangerous.
* Explain what will happen if we don't stop this increase.
* Explain what governments and industry can do to stop it.
* Explain the changes that families and individuals can make to
help the situation.