Synthetic fuels made from water and CO_2 could play a key role in decarbonising aviation. Andrew Wade reports. Concentrated solar energy has come a long way since the days of Archimedes. According to legend, the Greek polymath defended his home city of Syracuse from Roman soldiers using giant mirrors to focus the rays of the Sun, setting the invading ships on fire. It's a myth that has captured the imagination for centuries, celestial power harnessed by one of the great geniuses of antiquity to repel an attacking army.
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