Just last month the Salem airport was certified by the county as an "Earthwise" entity. Over at Information is Beautiful, McCandless and Bartels offer a lovely representation of the net difference between the carbon emissions of the Iceland volcano, the emissions of the European aviation system, and the net savings. That's the savings in black.
Though air travel can be important, it is also overused, and it is difficult sometimes to understand how a minor local airport is "wise." As Salem thinks about its transportation system and public subsidies, hopefully it will think deeply about cost-effective and carbon-prudent ways to move freight, people, and services.
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