This April, after I installed solar panels, I realized that transport was now about 80% of my carbon footprint. We heat with wood from our land in a super-efficient wood stove; we eat mostly local food; we are getting a plug in electric car to take advantage of our solar panels–but 2 flights to Europe and 4 domestic trips each year for seminars and conferences overwhelmed all our smaller changes. I’ve cut my flights by 75%, and I’ve turned down all but one conference trip, and one seminar each year (that’s the plan, anyway). My colleagues, who are mostly climate historians as well, are doing much the same.