Researchers harness algae to 'grow' construction cement

   Urban developers rely on cement made using limestone from quarries. [iStockphoto]

The massive worldwide pouring of concrete as developers densify cities could be transformed, eliminating heat-trapping pollution into the atmosphere, by switching to a new kind of cement created in Colorado — cement that is “grown” by harnessing tiny sea organisms.

Urban concrete jungles also would look less grey because the new cement is lighter in colour and more reflective.