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This system has been in use on some winter sports (bob, skeleton etc) for some years now and has always seemed fair to me. Once the run is over the competitor hits a tit and gets either a red or green light to see if they have to go for testing; a damn good idea.
TDyl writes: A small British company has produced the first "petrol from air" using a revolutionary technology that promises to solve the energy crisis as well as helping to curb global warming by removing carbon dioxide from the atmosphere.
Air Fuel Synthesis in Stockton-on-Tees has produced five litres of petrol since August when it switched on a small refinery that manufactures gasoline from carbon dioxide and water vapour.
The company hopes that within two years it will build a larger, commercial-scale plant capable of producing a ton of petrol a day. It also plans to produce green aviation fuel to make airline travel more carbon-neutral.