This is why they have changed the name to "climate change"; because the science of "global warming" is questionable. That doesn't mean that it is necessarily wrong, just that we don't really know enough about it.
I think that I would rather take a cautious approach until we know definitively, rather than providing a blank cheque to the industrial nations to spew out as much pollution as they like. It can't be a bad thing to reduce out pollution levels in cities anyway, regardless of the environmental effects.
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