[Robin Limb] The oil giants have never truly engaged with the concept of renewable energy, mainly because it is tiresome, high cost, and fraught with issues surrounding government support and legislation. To this day, it remains more expeditious and economic to simply keep pumping the 'black stuff' [read oil] out of the ground. The whole oil supply chain is geared to fossil fuels, and although it is technically possible to include bio-fuels such as ethanol and diesel at low levels, the economics are unexciting and uncertain.