Materials to take us beyond concrete
Concrete is everywhere, but it’s bad for the planet, generating large amounts of carbon dioxide – alternatives are being developed
A Concrete is the second most used substance in the global economy, after water – and one of the world’s biggest single sources of greenhouse gas emissions. The chemical process by which cement, the key ingredient of concrete, is created results in large quantities of carbon dioxide. The UN estimates that there will be 9.8 billion people living on the planet by mid-century. They will need somewhere to live. If concrete is the only answer to the construction of new cities, then carbon emissions will soar, aggravating global warming. And so scientists have started innovating with other materials, in a scramble for alternatives to a universal commodity that has underpinned our modem life for many years.
Materials to take us beyond concrete Reading Answer
1. G
2. D
3. C
4. F
5. Architects
6. Moisture
7. Layers
8. Speed
9. C
10. A
11. B
12. D
13. A
14. iii
15. viii
16. vi
17. v
18. vii
19. i
20. iv
21. A
22. C
23. B
24. Speed
25. Fifty/ 50
26. Strict
27. B
28. A
29. C
30. C
31. H
32. D
33. F
34. E
35. B
36. No
37. Not given
38. Yes
39. No
40. Not given
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