Science is defined in various ways but today it is generally restricted to something which is experimental which is repeatable which can be predicted and which is falsifiable.
Indeed the whole human species is endangered by nuclear weapons or by other means of wholesale destruction which further advances in science are likely to produce.
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The science is clear that there is an increase in the amount of CO2 in the atmosphere. What is not clear from the science is how much of that increase is caused by human activity and what also is not clear is what impact those increases have on the climatic cycle.