EarthThere's no such thing as 'clean coal' – it’s dirty and expensive Australia and the US want to revive an uneconomical and polluting technology, and, worse, Australia plans to take money from a clean energy fund to do it Analysis
SpaceIs new talk of interstellar drive too good to be true? Speculation about the EM drive, a proposed fuel-free, physics-busting starship engine, is back but is it still strictly for dreamers, wonders Geraint Lewis Comment