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Actually there is serious evidence that Global warming exists, *BUT* there is no direct and definitive proof that global warming
is a serious, long-term threat, or that people are a significant factor, since much evidence is based around computer models, and you only get out of computer models what you put in.
At his point in time we simply cannot say that we know much about it.
But IMHO we should still be seeking to reduce emissions and making renewable energy etc since this can only benefit us in the long term.
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