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Yes, metal can be recycled. It's still more energy-intensive than concrete. Materials intensity is a pretty good figure of merit for energy systems, and energy
by beefman 9y ago
Yes, metal can be recycled. It's still more energy-intensive than concrete. Materials intensity is a pretty good figure of merit for energy systems, and energy intensity is an ideal one.
- azernik 9y agoConcrete's CO2 emissions are, however, doubled by the chemical processes used to make cement.
- oldandtired 9y agoWhich is relevant in what way? The amount of concrete is small in relative terms, so doubling a small quantity is still a small quantity. A forest fire will put out significantly more CO2 and they occur quite frequently around the globe. If you want us to take your comment seriously, you will need to show that the CO2 emissions would be on some significant level.
- azernik 9y agoConcrete (specifically, the cement used to produce it) accounts for 5% of global CO2 emissions: http://blogs.ei.columbia.edu/2012/05/09/emissions-from-the-cement-industry/ http://blogs.ei.columbia.edu/2012/05/09/emissions-from-the-c...