Headline: “Air pollution kills ten million per year.” (That’s world-wide.) It degrades the health of billions. It fuzzes the landscape so much and so often that it’s a marvel when the horizon is sharply defined. Even if we weren’t experiencing the effects of global warming and living with the prospect of climate-change apocalypses, it should be a high priority of the nations of the world to reduce air pollution. It’s too bad that there is so much else to think about — so many other crises, so many more pressing concerns. It’s understandable: But one can see where humanity is heading. The horizon in that direction is quite sharply defined.