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At least three companies are hoping to bring supersonic airplanes back into the skies, but environmental groups worry their return could mean a big increase in greenhouse gasses from aviation. The issue is expected to come to the fore next…

UK carrier British Airways (BA) has partnered with renewable fuels company Velocys, after an earlier waste-to-fuel initiative named GreenSky with Washington-based Solena Fuels fell through. This latest venture uses fuel derived from waste biomass, similar to the GreenSky project that…