Omnia Disputanda (Question everything) is maintained by Michael Hart, professor emeritus of international affairs at Carleton University in Ottawa, Canada. This is a weblog on current events, focused on climate change, trade policy, and foreign policy, the subjects I pursued during my career both as a Canadian government official and as a professor at Carleton. It will also occasionally comment on such extraneous subjects as golf, family reunions, and other, less serious issues driven by my pastimes rather than my professional interests. Contributions on these issues by others are welcome and will be posted as quickly as I can read them and determine whether they fit. I will also occasionally cross-post an article that caught my eye and merits wider readership. Comments are welcome but will be moderated. I can be reached at m-hart@sympatico.ca.