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Climate Change Bill [Lords]

As my right hon. Friend the Secretary of State for Transport often explains, measures are being taken in the transport sector to ensure efficiencies and new technologies. We have debated the motor car, and we will come on to debate the inclusion of aviation in the Bill, which has been one of its controversial topics. On aviation, my right hon. Friend's point is that after the efficiencies in organisation and technologies have been best achieved, emissions will be offset when they are deemed unavoidable. I do question the hon. Gentleman's 90 per cent. figure—