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We can calculate the total global warming but we can't calculate why the Earth is warming. I pretty sure most people agree that the Earth is warming and that is backed by scientific fact.
What we don't know is why the Earth is warming. That is the point of the two variables and why I made the point that it is impossible to calculate X without Y and why it is impossible to calculate Y without X.
To get to the point, even though both variables do add to global warming, we can not say what is causing how much warming so it is a flawed argument to say that global warming is man-made or natural made. It just annoys me when people say "global warming is because of this" when they have no proof to back it up with.
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