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The Cars Universe has several trees and forests present in the movies.

Shouldn't they die from all the environmental pollution from so many cars moving all day? How could trees exist in world of living metal?

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It wasn't necessary

One approach could be:

Cars universe is basically human world, humans being replaced with various automotive types.

Ex: Italy is populated by popular Italian cars,mostly. And some cars have accent like humans do.

So about trees, Trees are part of life as we know it. So there should be trees. As you see, environmental pollution is everywhere, but there are still trees around us,isn't it?

And taking some points from movies, Some cars are using organic fuel (I forgot the name of the car, who lives in Radiator springs and friends with Mater and Mcqueen), Some converting themselves into electric cars.(in Cars 2, Sir Axelroad was faked but it shows some kind of notion that converting own-self to electric is very common thing) Most of the new cars are without need of bio-fuel (Mater's girlfriend,again I forgot the name).

So there should be no such huge environmental pollution as you suggesting. And as I mentioned previously, Trees are basic sign of life form anyone can identify and familiar with. So where there is life, to make it familiar to targeted audience(us humans) there should be trees.

Think for a minute, there is a world with only talking cars and basic buildings. will you like it? Will it be a good story to watch? Will it be familiar to you,your environment anyhow?

Those are the key points that made cars franchise so popular.

Another approach:

Some can argue that trees in that universe are little bit different and they can live with higher percentage of carbon-dioxide in the air.

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    You could also say that there's the same number of cars in the Cars world as in ours. Cars take up the same amount of space as they do now, most buildings would be bigger as they need to accommodate cars moving within them. High-density cities for example just couldn't fit millions of cars in the same area; so while the Cars population may be higher than the number of cars in our world, it should still be far less than our population of humans. – sirjonsnow Feb 1 '18 at 14:24
  • Different approach, and its good. but how can you say about the number of cars in the world?(in cars universe i mean)... Adding another point of view, you mentioned about high density cities. What if they just increase the landmark for the cities while they accommodate bigger buildings? something like building a regular city for dinosaurs. it'd be bigger on our measurements, but it'd be regular for dinosaurs. – Vishwa Feb 5 '18 at 5:35

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