Cities are Built of Steel and Cement. How Can We Make These More Sustainable? by @DavidKThorpe

It turns out, for example, that we should not be worrying about plastic bag use (responsible for less than one hundredth of a percentage point of national greenhouse gas emissions) so much as on industrial emissions, i.e. those connected with materials production, which comprise 35% of all energy/process greenhouse gas emissions. That's more than buildings (31%) and transport (27%). Of industrial carbon emissions, the single material responsible for the most emissions is steel production (25%), followed by cement at 19%. Combined, that's nearly half of all industrial emissions, and bear in mind that these two are the principal materials for building city infrastructure.

Full article: http://www.sustainablecitiescollective.com/node/1091444

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