Carbon

Carbon is a raw material introduced in the Iron Age, along with Iron.

It is used in the production of the following items:
 * Steel
 * Broadcast Tower
 * Exercise Machine
 * Jet Fuel
 * Vladimir Putin's Gym Shorts
 * Convince Everyone Livejournal is Cool Again
 * ICBM
 * Missile
 * Inconveniently Small Dragons
 * All Actors Replaced by Jeff Bridges
 * Carrot Top's Exercise Videos
 * Rubber Bullets That Make You Forget The Alamo