The movie "Reign of Fire" 2002

In London in 2002, Quinn, a 12-year-old boy, accidentally awakens a huge dragon from its centuries-long sleep. Eighteen years later, the devastation left by the beast and its offspring can be seen almost everywhere on the planet. Dragons are highly intelligent, highly evolved beings… and they have no intention of sharing the Earth with humans. Quinn has grown up and is now a fire chief. His job is to keep the beasts at bay and defend a small community fighting to survive. In the middle of this chaos appears Van Zan, the leader of a group of armed Americans, who claims to know how to kill dragons and save humanity, with a method Quinn has never seen before…