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I think most lay people start with a belief in one view or another and then find the "facts" to support their predisposition. That is partly how people approach many things, but in this instance, the science involved is also way over the heads of non-scientists.
There are distinguished scientists on both sides who cannot agree, but even among the larger number who warn that increasing pollution will have dire effects, there is disagreement about exactly how. A year or two ago, for example, I saw a program presenting the view that extra cloud cover will push us into a new ice age. A program like that only has to be well made, to cause concern to anyone who is in no position to argue with the experts.
I don't pretend to have judged whether there will or will not be global warming. In any case, I shall not be around long enough to suffer its consequences. I simply have the view that no-one claims there is any benefit to pumping pollution into the environment. In my lifetime alone, I am aware of waters in which, if fish still survive at all, they are no longer safe to eat; of respiratory diseases affecting many more people, more seriously; etc.
In other words, there are many reasons to be seriously concerned about pollution, whether or not you believe the consequences will be cataclysmic.
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