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" In order to put the Zero Emissions concept into practice , reusable materials that would have low environmental impact , as an alternative for the exhaustible engines or engines with less CO2 emissions are highly desirable ; among such candidates , the most feasible resource is so-called " biomass " . That 's because from spring 2008 you 'll be able to buy a Jaguar that will look a lot like the stunning new C-XF concept . Achieving battle-space superiority in forward theaters is central to the Sea Shield concept , especially as enemy area - denial efforts become more capable .