BMW has already scooped CAR’s green award for its Efficient Dynamics eco package being rolled out onto its current range. But at the 2008 Geneva Motor Show, the Bavarians will unveil their vision for the next generation. The X5 concept showcases BMW’s new eight-speed gearbox and even has roof-mounted solar panels to top up the battery. The company claims it’s enough to make the X5 (only a show idea at this stage, remember) the cleanest large 4x4 in the