Learn about the four main types of chemical reactions.
Learn about the special conditions that let some chemical reactions take place.
Catalytic converters use noble metals as catalysts to speed up chemical reactions. This makes vehicle emissions less harmful.
There are many forms of transportation and many sources of energy that enable these forms of transportation to get where they are going.
This backgrounder explains what greenhouse gases are and how they contribute to climate change.
This backgrounder describes how vehicle emissions work and how they affect air quality, including their contribution to smog.
Hydrogen’s tendency towards combustion is what makes it both a dangerous chemical element and a useful energy source.