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The Earth would be very cold.

Carbon is a byproduct of life. We are going to find it anywhere that life exists.

Ian Plimer, a well known climate sceptic, in his book "Heaven and Earth" says that the Earth would be 18degC ( 32.4 deg F) colder if there was no CO2 present in the atmosphere. So some CO2 is definitely a good thing!

However, The IPCC say that a doubling of Co2 levels to 560ppmv from 280ppmv, the pre-industrial level, and which will occur later this century on present trends, will cause a further warming of around 3 degC (5.4 deg F)

So maybe we can have too much of a good thing, and like Goldilocks, we should aim to get things just right. Not too little and not too much.

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Q: What if there were no carbon dioxide on earth?
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