The article discusses the concept of carbon footprint. The two types of footprints are primary, which is a measure of direct carbon dioxide emissions, and secondary, which is a measure of indirect carbon dioxide emissions. The efforts of Corus, a subsidiary of Tata Steel, in reducing the world's secondary footprint include pollution control initiatives and upgrades through Spooner Industries. The solutions offered by the partnership between Spooner and Anguil Environmental Systems are also cited.