Beton hat eine schlechte Klimabilanz. Rund sieben Prozent
der globalen Triebhausgasemissionen gehen auf seinen Einsatz zurück. Das
liegt am Zement, der nötig ist, um den Baustoff fest werden zu lassen.
Bei der Herstellung, weltweit sind es laut IEA gut vier Milliarden
Tonnen pro Jahr,
wird viel Kohlendioxid frei: schätzungsweise bis zu zwei Milliarden Tonnen aus
chemischen Reaktionen sowie beim energieintensiven Brennen der Rohstoffe.
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