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Too many extremists on both sides of this debate; including those writing papers and books on the subject. I think it tends to polarize people into all or nothing camps.
The science of the greenhouse effect is tight. The planet has been warming lately.
But .. From there you have to consider anthropogenic causes vs. non-anthropogenic causes. A good example being possible natural patterns of ocean salinity causing changes in ocean currents (thermohaline circulation).
Then after that, say you accept there has been mostly anthropogenic warming and that it will continue for a while, one might want to consider what would be the optimal temperature for the planet. What if it is 3 degrees higher than today? What about 5? Many more people die of cold death than heat deaths today. Are the additional lives saved from warmer temperature (up until some point) worth letting the planet warm? Or would we be playing a dangerous game?
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