Listen to the noises of the city. The noises of the motors, the machines. The buzzing of the electric devices. The tires on the tarmac. The chatter of the people, the humming of the planes.
Listen to the noise of the exhaust pipes. The exhaust streaming out of millions of exhaust pipes. Listen to all the sounds of the city.
That hissing sound is the breath of the dragon.
When the dragon lifts its head, it will start to spit fire. In its singeing breath, our world will wither away.