~ List the percentage composition of air.

~ What is the source of carbon monoxide, and the harmful effects of carbon monoxide?

~ What are the harmful effects of acid rain?

~ Burning biodiesel as a fuel is considered to be a “carbon neutral” activity. Explain what is meant by “carbon neutral” in this context.

~ What is the importance of the ozone layer?

~ List the 3 consequences of global warming.

~ What is the source of sulfur dioxide, and the harmful effects of sulfur dioxide?

~ Explain how combustion engines produce nitrogen oxides.

~ What are greenhouse gases? What are the sources of these greenhouse gases?

~ Describe the potential effects of the increased levels of greenhouse gases like carbon dioxide and methane.