Dumping sugar into the petrol tank may be just the ticket for cleaner air and cheaper fuel. Sugars and starches such as glucose, dextrose and even cellulose in mowed grass and other plant waste would be converted into hydrogen -- perhaps the least polluting fuel of all. The transformation is done by two deep-sea enzymes. They come from bacteria that live near the volcanic vents in the deepest, darkest abysses of the sea. The enzyme pair can pluck atoms from glucose molecules and reassemble them into hydrogen molecules.
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