Why did God have to flood the world anyway? Couldn't he have just snapped his fingers and made all the bad people disappear? It's not like he had to teach the people he killed a lesson. It would have saved the innocent slaughter of millions of animals, and destruction of the world's trees. Just think of how many old growth trees we would have had if they didn't have to grow from scratch again?
Same goes for Soddom and Gommorah getting burned to the ground with fire and brimstone. The after affects to the air quality are still being felt. God's carbon footprint is way too big.