There have been very many models to predict the effect of carbon dioxide on global temperature. Building lots of models and then selecting the one which was right is not the scientific method. It's like using financial models to predict the behavior of the stock market; if you do enough of them, some will be right at predicting the future. Of course you test them by predicting the past and selecting ones which did the best job. It turns out that none of them really predict the future.
It is the same with global warming. Some will do the best job by accident and have nothing to do with actual science. It is well known that none of the past models predicted the stationary temperatures observed for the last 18 years or so. Here's an article about confirmation bias as it relates to global warming.
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