MANY CONTRIBUTORS to global warming, such as the internal combustion engine, are being phased out. Others, such as concrete - which is responsible for 8 per cent of all greenhouse gas emissions - are not. This is because there is no real alternative to the material that underpins everything from Hadrian's Wall to the Burj Khalifa. Concrete - and the cement that plays a critical role in its performance - is here to stay.
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