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Climate Change Bill [HL]

I thank the Minister for the fullness of his response. I have two questions. At the end of his speech, he mentioned that the committee would have as its priority the seeking of advice on methodology. What happens if it comes up with no methodology; in other words, if it cannot find a solution? Where would that leave us on the Bill? He also said that data were not available on the way that international emissions work. Presumably, those data would need to be found before the committee could attempt to give advice on methodology. I am slightly perplexed. I think all of us wish to have international aviation included, accepting that it will, we hope, be agreed at European level. I am worried that we are nearly not tackling the issue at this stage because it is insoluble. Can the Minister come back on that?