@Followthethings has just published a short post I recently wrote on the methodological challenges of following natural gas. You can check it out on their blog at: https://followtheblog.org/2017/08/21/guest-post-hard-to-follow-things-natural-gas-by-peter-forman/

While you are at it, why not check out Ian and his students’ work on their other website, www.followthethings.com?