But that is the point isn't it? If there is an alternative explanation with equally (or in this case greater) observational and logically consistent arguement then it casts a shadow on the the original hypothesis. In this case, we can measure some increase in temperature. Is this due to x, y, z reason? Where x is man made co2 release, y is sunspot activity and z is some unknown. You claim it is x. But y has a greater correlation. And it could still be z or any combination. What is not clear is that x is causing anymore than the other reasons and appears to have less.
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