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… secondary metals production and ferro-alloys; oil and gas extraction and transport; and industrial and some … annual emissions of mercury to air. Another 10% comes from natural geological sources, and the rest (60%) is from … fact that anthropogenic emissions have been larger than natural emissions since the start of the industrial age about …

… For CFC and HCFC: nitrogen plasma arc, microwave plasma, gas phase catalytic dehalogenation and super-heated steam … of methyl bromide were originally conceived to protect natural ecosystems and agriculture from the accidental … could be comparable to various other factors such as the natural variability of global ozone, its secular trend over a …