The Roberts Environmental Center has released its 2006 analysis of environmental and sustainability reporting in the metals, mining, and crude-oil sectors. Of the 30 companies studied, BHP Billiton had by far the best environmental and sustainability reporting...Alcan (Canada), the second highest scorer confines its activities to aluminum, and Corus (Britain) to aluminum and steel...The lowest scores, a result of failure to post more than a minimal amount of company-specific environmental or social information on their Web sites, went to US Steel and AK Steel in the struggling American steel sector. [also refers to Alcoa, Arcelor, Pemex]