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… The 1994 Second Sulphur Protocol acknowledges the need for precautionary measures to prevent transboundary air pollution … http://leo.informea.org/terms/precautionary-principle …

… Conference on the Human Environment, and in particular principle 21, which expresses the common conviction that … have harmful effects on human health, Resolved to take precautionary measures to anticipate, prevent or minimize … postponing such measures, taking into account that such precautionary measures to deal with emissions of air …