nor any drop to drink

Dr Una Ryan’s startup, Waltham Technologies, proposes the use of blue-green algae to provide “a way of cleaning water in which the only input is dirty water and a little bit of light, and what you get out is clean water, enzymes and stock for biofuels”.

Also of interest are the use of materials like the smart sponge and aerogels to soak up oil spills.

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