Carbon-negative blocks and bricks have been developed by U.K.-based Encos, and they slash greenhouse-gas emissions by an estimated 160% for blocks and 120% for bricks. Made from "incinerated sewage sludge ash" bound together by an oil derived from plants that have absorbed carbon dioxide, the oil undergoes a process that converts it into a binder that does not require water. Encos is producing the odorless blocks and bricks, which have passed U.K. industry strength, heat and cooling standards.

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