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Building s hard problem - making concrete green © Getty Images The Pantheon in Rome - almost 2,000 years old and built from concrete A time-travelling Victorian stumbling upon a modern building site could largely get right to work, says Chris Thompson, managing director of Citu, which specialises in building low-carbon homes. That s because many of the materials and tools would be familiar to him. The Victorian builder would certainly recognise concrete, which has been around for a long time. The world s largest unreinforced concrete dome remains the one at Rome s Pantheon, which is almost 2,000 years old. The Colosseum is largely concrete too.

United kingdomBaden wübergNorth seaOceans generalEcole polytechniqueDaniel rennieChris thompsonFernando martirenaDavide zampiniKaren scrivenerGetty images the pantheonCemex someProf fernando martirenaLow emissions intensity limeHeidelberg cementClaude lor