I’ve known for a while now that the real action on sustainability is happening in cities — other than Washington, D.C., that is — but a few months back, it came to my attention that many of the people leading the charge are women, often young ones.While higher-up positions in city government are still skewed in favor of men, sustainability directors seem to be more evenly split between the genders. Because most sustainability director positions have been created in the last 10 years, there isn’t the same good-ol’-boy hierarchy in place. And due to the fact that the field is so young, so are many of its practitioners. Take, for example, Katherine