We've not been as successful at outsourcing the pollution as you might think. https://www.zmescience.com/ecology/environmental-issues/about-29-of-san-francisco

We've not been as successful at outsourcing the pollution as you might think. https://www.zmescience.com/ecology/environmental-issues/about-29-of-san-franciscos-pollution-comes-from-china-42334/ https://www.zmescience.com/ecology/environmental-issues/abou...