One of the world's biggest engineering problems is concrete. Critical infrastructure built over the last century bridges, highways, dams, and buildings are now crumbling before our eyes. Repairing and rebuilding this decaying infrastructure.
Thousands of years worth of chemical interaction between a particular type of volcanic ash and water have made the Roman concrete stronger, not weaker, over time.
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The production of steel, cement, and ammonia together emit about one-fifth of all human-caused CO2. Technologies are emerging that promise to decarbonize these problem industries, but analysts warn big challenges remain before the processes can be cleaned up.
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