It's exactly the second time - so far. There are so, so many great things we can do. Removing or mitigating toxic chemicals from airplane air is on that list f

It's exactly the second time - so far. There are so, so many great things we can do. Removing or mitigating toxic chemicals from airplane air is on that list for sure. But I think it's responsible to consider things not in isolation, but with the understanding that doing any one of those awesome things come at the expense of many other things. I don't often see folks trying to quantify the level of goodness that comes from an activity or the level of effort involved in attaining it. Simply recognizing this as a trade off would be a healthy step.