After driving through many beautiful parts of the forest, we finally left and made our way back north. As we entered the city Yibin we saw this. The sky got really dark as we entered the city and we suppose this is why. We couldn't figure out if it was a coal fired power plant or just for refining. There were many barges full of coal moving up and down the river. I am curious to know how that all fits together. Coal makes everything dirty.