Further reading
The Haber-Bosch process (BBC World Service) [Tip: hold Ctrl and click a link to open it in a new tab. (Hide tip)]
William Smith’s map is on display at the Geological Society in London, where you can visit it during office hours without an appointment: Visiting the William Smith Map
You can find out more about oil, and the possibilities for living without oil, in another short OpenLearn course: Living without oil